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Finding the Fourth Proportional to 143,619.80, 215,429.70 and 81,411.80

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Solution

The fourth proportional to 143,619.80, 215,429.70 and 81,411.80 is: 122,117.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,619.80 : 215,429.70 = 81,411.80 : x
  2. Step 2: Convert to fraction form
    143,619.80/215,429.70 = 81,411.80/x
  3. Step 3: Cross multiply
    143,619.80x = 215,429.70 × 81,411.80
  4. Step 4: Simplify right side
    143,619.80x = 17,538,519,650.46
  5. Step 5: Solve for x
    x = 17,538,519,650.46/143,619.80
  6. Step 6: Final answer
    x = 122,117.70

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