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Finding the Fourth Proportional to 138,453.75, 191,129.96 and 81,085.09

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Solution

The fourth proportional to 138,453.75, 191,129.96 and 81,085.09 is: 111,934.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,453.75 : 191,129.96 = 81,085.09 : x
  2. Step 2: Convert to fraction form
    138,453.75/191,129.96 = 81,085.09/x
  3. Step 3: Cross multiply
    138,453.75x = 191,129.96 × 81,085.09
  4. Step 4: Simplify right side
    138,453.75x = 15,497,790,008.30
  5. Step 5: Solve for x
    x = 15,497,790,008.30/138,453.75
  6. Step 6: Final answer
    x = 111,934.78

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