Finding the Fourth Proportional to 9,354.38, 12,909.31 and 5,162.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.38 : 12,909.31 = 5,162.90 : x
2. Step 2: Convert to fraction form
   9,354.38/12,909.31 = 5,162.90/x
3. Step 3: Cross multiply
   9,354.38x = 12,909.31 × 5,162.90
4. Step 4: Simplify right side
   9,354.38x = 66,649,476.60
5. Step 5: Solve for x
   x = 66,649,476.60/9,354.38
6. Step 6: Final answer
   x = 7,124.95