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Finding the Fourth Proportional to 13,977.70, 20,970.19 and 5,212.69

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Solution

The fourth proportional to 13,977.70, 20,970.19 and 5,212.69 is: 7,820.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,977.70 : 20,970.19 = 5,212.69 : x
  2. Step 2: Convert to fraction form
    13,977.70/20,970.19 = 5,212.69/x
  3. Step 3: Cross multiply
    13,977.70x = 20,970.19 × 5,212.69
  4. Step 4: Simplify right side
    13,977.70x = 109,311,053.80
  5. Step 5: Solve for x
    x = 109,311,053.80/13,977.70
  6. Step 6: Final answer
    x = 7,820.39

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