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Finding the Fourth Proportional to 13,871.20, 20,835.84 and 11,790.88

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Solution

The fourth proportional to 13,871.20, 20,835.84 and 11,790.88 is: 17,711.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,871.20 : 20,835.84 = 11,790.88 : x
  2. Step 2: Convert to fraction form
    13,871.20/20,835.84 = 11,790.88/x
  3. Step 3: Cross multiply
    13,871.20x = 20,835.84 × 11,790.88
  4. Step 4: Simplify right side
    13,871.20x = 245,672,889.14
  5. Step 5: Solve for x
    x = 245,672,889.14/13,871.20
  6. Step 6: Final answer
    x = 17,711.00

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