Finding the Fourth Proportional to 9,354.53, 12,909.17 and 5,162.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.53 : 12,909.17 = 5,162.78 : x
2. Step 2: Convert to fraction form
   9,354.53/12,909.17 = 5,162.78/x
3. Step 3: Cross multiply
   9,354.53x = 12,909.17 × 5,162.78
4. Step 4: Simplify right side
   9,354.53x = 66,647,153.05
5. Step 5: Solve for x
   x = 66,647,153.05/9,354.53
6. Step 6: Final answer
   x = 7,124.59