Finding the Fourth Proportional to 9,916.10, 14,910.60 and 8,312.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,916.10 : 14,910.60 = 8,312.30 : x
2. Step 2: Convert to fraction form
   9,916.10/14,910.60 = 8,312.30/x
3. Step 3: Cross multiply
   9,916.10x = 14,910.60 × 8,312.30
4. Step 4: Simplify right side
   9,916.10x = 123,941,380.38
5. Step 5: Solve for x
   x = 123,941,380.38/9,916.10
6. Step 6: Final answer
   x = 12,499.00