Finding the Fourth Proportional to 11,499.32, 15,854.10 and 8,670.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,499.32 : 15,854.10 = 8,670.80 : x
2. Step 2: Convert to fraction form
   11,499.32/15,854.10 = 8,670.80/x
3. Step 3: Cross multiply
   11,499.32x = 15,854.10 × 8,670.80
4. Step 4: Simplify right side
   11,499.32x = 137,467,730.28
5. Step 5: Solve for x
   x = 137,467,730.28/11,499.32
6. Step 6: Final answer
   x = 11,954.42