Finding the Fourth Proportional to 8,816.59, 12,162.72 and 5,458.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,816.59 : 12,162.72 = 5,458.15 : x
2. Step 2: Convert to fraction form
   8,816.59/12,162.72 = 5,458.15/x
3. Step 3: Cross multiply
   8,816.59x = 12,162.72 × 5,458.15
4. Step 4: Simplify right side
   8,816.59x = 66,385,950.17
5. Step 5: Solve for x
   x = 66,385,950.17/8,816.59
6. Step 6: Final answer
   x = 7,529.66