Finding the Fourth Proportional to 9,354.72, 12,909.42 and 5,377.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,354.72 : 12,909.42 = 5,377.08 : x
2. Step 2: Convert to fraction form
   9,354.72/12,909.42 = 5,377.08/x
3. Step 3: Cross multiply
   9,354.72x = 12,909.42 × 5,377.08
4. Step 4: Simplify right side
   9,354.72x = 69,414,984.09
5. Step 5: Solve for x
   x = 69,414,984.09/9,354.72
6. Step 6: Final answer
   x = 7,420.32