Finding the Fourth Proportional to 31,915.43, 47,876.42 and 12,210.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,915.43 : 47,876.42 = 12,210.56 : x
2. Step 2: Convert to fraction form
   31,915.43/47,876.42 = 12,210.56/x
3. Step 3: Cross multiply
   31,915.43x = 47,876.42 × 12,210.56
4. Step 4: Simplify right side
   31,915.43x = 584,597,899.00
5. Step 5: Solve for x
   x = 584,597,899.00/31,915.43
6. Step 6: Final answer
   x = 18,317.09