Finding the Fourth Proportional to 31,422.29, 47,167.59 and 12,715.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,422.29 : 47,167.59 = 12,715.21 : x
2. Step 2: Convert to fraction form
   31,422.29/47,167.59 = 12,715.21/x
3. Step 3: Cross multiply
   31,422.29x = 47,167.59 × 12,715.21
4. Step 4: Simplify right side
   31,422.29x = 599,745,576.21
5. Step 5: Solve for x
   x = 599,745,576.21/31,422.29
6. Step 6: Final answer
   x = 19,086.63