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Finding the Fourth Proportional to 402,999.86, 556,139.80 and 221,707.89

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Solution

The fourth proportional to 402,999.86, 556,139.80 and 221,707.89 is: 305,956.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,999.86 : 556,139.80 = 221,707.89 : x
  2. Step 2: Convert to fraction form
    402,999.86/556,139.80 = 221,707.89/x
  3. Step 3: Cross multiply
    402,999.86x = 556,139.80 × 221,707.89
  4. Step 4: Simplify right side
    402,999.86x = 123,300,581,884.83
  5. Step 5: Solve for x
    x = 123,300,581,884.83/402,999.86
  6. Step 6: Final answer
    x = 305,956.89

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