Finding the Fourth Proportional to 19,996.52, 29,978.55 and 8,318.48

Step by Step Solution

1. Step 1: Write the proportion equation
   19,996.52 : 29,978.55 = 8,318.48 : x
2. Step 2: Convert to fraction form
   19,996.52/29,978.55 = 8,318.48/x
3. Step 3: Cross multiply
   19,996.52x = 29,978.55 × 8,318.48
4. Step 4: Simplify right side
   19,996.52x = 249,375,818.71
5. Step 5: Solve for x
   x = 249,375,818.71/19,996.52
6. Step 6: Final answer
   x = 12,470.96