Finding the Fourth Proportional to 9,354.88, 12,909.61 and 5,375.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.88 : 12,909.61 = 5,375.90 : x
2. Step 2: Convert to fraction form
   9,354.88/12,909.61 = 5,375.90/x
3. Step 3: Cross multiply
   9,354.88x = 12,909.61 × 5,375.90
4. Step 4: Simplify right side
   9,354.88x = 69,400,811.39
5. Step 5: Solve for x
   x = 69,400,811.39/9,354.88
6. Step 6: Final answer
   x = 7,418.68