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Finding the Fourth Proportional to 13,719.80, 20,579.70 and 12,510.20

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Solution

The fourth proportional to 13,719.80, 20,579.70 and 12,510.20 is: 18,765.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,719.80 : 20,579.70 = 12,510.20 : x
  2. Step 2: Convert to fraction form
    13,719.80/20,579.70 = 12,510.20/x
  3. Step 3: Cross multiply
    13,719.80x = 20,579.70 × 12,510.20
  4. Step 4: Simplify right side
    13,719.80x = 257,456,162.94
  5. Step 5: Solve for x
    x = 257,456,162.94/13,719.80
  6. Step 6: Final answer
    x = 18,765.30

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