Finding the Fourth Proportional to 9,639.98, 13,302.48 and 5,660.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639.98 : 13,302.48 = 5,660.55 : x
2. Step 2: Convert to fraction form
   9,639.98/13,302.48 = 5,660.55/x
3. Step 3: Cross multiply
   9,639.98x = 13,302.48 × 5,660.55
4. Step 4: Simplify right side
   9,639.98x = 75,299,342.55
5. Step 5: Solve for x
   x = 75,299,342.55/9,639.98
6. Step 6: Final answer
   x = 7,811.15