Finding the Fourth Proportional to 8,115.72, 12,151.82 and 5,645.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,115.72 : 12,151.82 = 5,645.32 : x
2. Step 2: Convert to fraction form
   8,115.72/12,151.82 = 5,645.32/x
3. Step 3: Cross multiply
   8,115.72x = 12,151.82 × 5,645.32
4. Step 4: Simplify right side
   8,115.72x = 68,600,912.48
5. Step 5: Solve for x
   x = 68,600,912.48/8,115.72
6. Step 6: Final answer
   x = 8,452.84