Finding the Fourth Proportional to 6,261.31, 8,639.31 and 3,608.02

Step by Step Solution

1. Step 1: Write the proportion equation
   6,261.31 : 8,639.31 = 3,608.02 : x
2. Step 2: Convert to fraction form
   6,261.31/8,639.31 = 3,608.02/x
3. Step 3: Cross multiply
   6,261.31x = 8,639.31 × 3,608.02
4. Step 4: Simplify right side
   6,261.31x = 31,170,803.27
5. Step 5: Solve for x
   x = 31,170,803.27/6,261.31
6. Step 6: Final answer
   x = 4,978.32