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Finding the Fourth Proportional to 8,700.20, 13,047.56 and 2,855.45

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Solution

The fourth proportional to 8,700.20, 13,047.56 and 2,855.45 is: 4,282.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.20 : 13,047.56 = 2,855.45 : x
  2. Step 2: Convert to fraction form
    8,700.20/13,047.56 = 2,855.45/x
  3. Step 3: Cross multiply
    8,700.20x = 13,047.56 × 2,855.45
  4. Step 4: Simplify right side
    8,700.20x = 37,256,575.69
  5. Step 5: Solve for x
    x = 37,256,575.69/8,700.20
  6. Step 6: Final answer
    x = 4,282.27

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