Finding the Fourth Proportional to 9,862.88, 13,610.27 and 5,385.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,862.88 : 13,610.27 = 5,385.78 : x
2. Step 2: Convert to fraction form
   9,862.88/13,610.27 = 5,385.78/x
3. Step 3: Cross multiply
   9,862.88x = 13,610.27 × 5,385.78
4. Step 4: Simplify right side
   9,862.88x = 73,301,919.96
5. Step 5: Solve for x
   x = 73,301,919.96/9,862.88
6. Step 6: Final answer
   x = 7,432.10