Finding the Fourth Proportional to 8,140.16, 12,137.09 and 7,445.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,140.16 : 12,137.09 = 7,445.10 : x
2. Step 2: Convert to fraction form
   8,140.16/12,137.09 = 7,445.10/x
3. Step 3: Cross multiply
   8,140.16x = 12,137.09 × 7,445.10
4. Step 4: Simplify right side
   8,140.16x = 90,361,806.69
5. Step 5: Solve for x
   x = 90,361,806.69/8,140.16
6. Step 6: Final answer
   x = 11,100.74