Finding the Fourth Proportional to 31,381.76, 47,078.72 and 10,606.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,381.76 : 47,078.72 = 10,606.72 : x
2. Step 2: Convert to fraction form
   31,381.76/47,078.72 = 10,606.72/x
3. Step 3: Cross multiply
   31,381.76x = 47,078.72 × 10,606.72
4. Step 4: Simplify right side
   31,381.76x = 499,350,801.00
5. Step 5: Solve for x
   x = 499,350,801.00/31,381.76
6. Step 6: Final answer
   x = 15,912.13