Finding the Fourth Proportional to 8,385.72, 12,572.58 and 3,940.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,385.72 : 12,572.58 = 3,940.89 : x
2. Step 2: Convert to fraction form
   8,385.72/12,572.58 = 3,940.89/x
3. Step 3: Cross multiply
   8,385.72x = 12,572.58 × 3,940.89
4. Step 4: Simplify right side
   8,385.72x = 49,547,154.80
5. Step 5: Solve for x
   x = 49,547,154.80/8,385.72
6. Step 6: Final answer
   x = 5,908.52