Finding the Fourth Proportional to 9,889.31, 13,646.72 and 5,639.24

Step by Step Solution

1. Step 1: Write the proportion equation
   9,889.31 : 13,646.72 = 5,639.24 : x
2. Step 2: Convert to fraction form
   9,889.31/13,646.72 = 5,639.24/x
3. Step 3: Cross multiply
   9,889.31x = 13,646.72 × 5,639.24
4. Step 4: Simplify right side
   9,889.31x = 76,957,032.86
5. Step 5: Solve for x
   x = 76,957,032.86/9,889.31
6. Step 6: Final answer
   x = 7,781.84