Finding the Fourth Proportional to 31,416.42, 47,123.42 and 10,639.92

Step by Step Solution

1. Step 1: Write the proportion equation
   31,416.42 : 47,123.42 = 10,639.92 : x
2. Step 2: Convert to fraction form
   31,416.42/47,123.42 = 10,639.92/x
3. Step 3: Cross multiply
   31,416.42x = 47,123.42 × 10,639.92
4. Step 4: Simplify right side
   31,416.42x = 501,389,418.93
5. Step 5: Solve for x
   x = 501,389,418.93/31,416.42
6. Step 6: Final answer
   x = 15,959.47