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Finding the Fourth Proportional to 20,786.30, 28,694.53 and 13,242.97

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Solution

The fourth proportional to 20,786.30, 28,694.53 and 13,242.97 is: 18,281.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.30 : 28,694.53 = 13,242.97 : x
  2. Step 2: Convert to fraction form
    20,786.30/28,694.53 = 13,242.97/x
  3. Step 3: Cross multiply
    20,786.30x = 28,694.53 × 13,242.97
  4. Step 4: Simplify right side
    20,786.30x = 380,000,799.95
  5. Step 5: Solve for x
    x = 380,000,799.95/20,786.30
  6. Step 6: Final answer
    x = 18,281.31

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