Finding the Fourth Proportional to 8,400.72, 12,605.88 and 8,381.04

Step by Step Solution

1. Step 1: Write the proportion equation
   8,400.72 : 12,605.88 = 8,381.04 : x
2. Step 2: Convert to fraction form
   8,400.72/12,605.88 = 8,381.04/x
3. Step 3: Cross multiply
   8,400.72x = 12,605.88 × 8,381.04
4. Step 4: Simplify right side
   8,400.72x = 105,650,384.52
5. Step 5: Solve for x
   x = 105,650,384.52/8,400.72
6. Step 6: Final answer
   x = 12,576.35