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Finding the Fourth Proportional to 87,690.72, 121,013.72 and 47,404.36

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Solution

The fourth proportional to 87,690.72, 121,013.72 and 47,404.36 is: 65,418.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,690.72 : 121,013.72 = 47,404.36 : x
  2. Step 2: Convert to fraction form
    87,690.72/121,013.72 = 47,404.36/x
  3. Step 3: Cross multiply
    87,690.72x = 121,013.72 × 47,404.36
  4. Step 4: Simplify right side
    87,690.72x = 5,736,577,947.82
  5. Step 5: Solve for x
    x = 5,736,577,947.82/87,690.72
  6. Step 6: Final answer
    x = 65,418.30

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