Finding the Fourth Proportional to 31,422.79, 47,168.34 and 12,715.71

Step by Step Solution

1. Step 1: Write the proportion equation
   31,422.79 : 47,168.34 = 12,715.71 : x
2. Step 2: Convert to fraction form
   31,422.79/47,168.34 = 12,715.71/x
3. Step 3: Cross multiply
   31,422.79x = 47,168.34 × 12,715.71
4. Step 4: Simplify right side
   31,422.79x = 599,778,932.62
5. Step 5: Solve for x
   x = 599,778,932.62/31,422.79
6. Step 6: Final answer
   x = 19,087.39