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Finding the Fourth Proportional to 28,636.19, 42,955.10 and 7,859.69

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Solution

The fourth proportional to 28,636.19, 42,955.10 and 7,859.69 is: 11,789.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,636.19 : 42,955.10 = 7,859.69 : x
  2. Step 2: Convert to fraction form
    28,636.19/42,955.10 = 7,859.69/x
  3. Step 3: Cross multiply
    28,636.19x = 42,955.10 × 7,859.69
  4. Step 4: Simplify right side
    28,636.19x = 337,613,769.92
  5. Step 5: Solve for x
    x = 337,613,769.92/28,636.19
  6. Step 6: Final answer
    x = 11,789.76

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