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Finding the Fourth Proportional to 86,502.80, 129,851.40 and 66,868.40

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Solution

The fourth proportional to 86,502.80, 129,851.40 and 66,868.40 is: 100,377.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,502.80 : 129,851.40 = 66,868.40 : x
  2. Step 2: Convert to fraction form
    86,502.80/129,851.40 = 66,868.40/x
  3. Step 3: Cross multiply
    86,502.80x = 129,851.40 × 66,868.40
  4. Step 4: Simplify right side
    86,502.80x = 8,682,955,355.76
  5. Step 5: Solve for x
    x = 8,682,955,355.76/86,502.80
  6. Step 6: Final answer
    x = 100,377.74

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