Finding the Fourth Proportional to 31,815.52, 47,719.62 and 8,443.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,815.52 : 47,719.62 = 8,443.78 : x
2. Step 2: Convert to fraction form
   31,815.52/47,719.62 = 8,443.78/x
3. Step 3: Cross multiply
   31,815.52x = 47,719.62 × 8,443.78
4. Step 4: Simplify right side
   31,815.52x = 402,933,972.96
5. Step 5: Solve for x
   x = 402,933,972.96/31,815.52
6. Step 6: Final answer
   x = 12,664.70