Finding the Fourth Proportional to 8,312.93, 12,429.30 and 8,116.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,312.93 : 12,429.30 = 8,116.10 : x
2. Step 2: Convert to fraction form
   8,312.93/12,429.30 = 8,116.10/x
3. Step 3: Cross multiply
   8,312.93x = 12,429.30 × 8,116.10
4. Step 4: Simplify right side
   8,312.93x = 100,877,441.73
5. Step 5: Solve for x
   x = 100,877,441.73/8,312.93
6. Step 6: Final answer
   x = 12,135.00