Finding the Fourth Proportional to 9,385.87, 12,952.07 and 5,407.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,385.87 : 12,952.07 = 5,407.55 : x
2. Step 2: Convert to fraction form
   9,385.87/12,952.07 = 5,407.55/x
3. Step 3: Cross multiply
   9,385.87x = 12,952.07 × 5,407.55
4. Step 4: Simplify right side
   9,385.87x = 70,038,939.09
5. Step 5: Solve for x
   x = 70,038,939.09/9,385.87
6. Step 6: Final answer
   x = 7,462.17