Finding the Fourth Proportional to 9,880.96, 13,635.43 and 5,404.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.96 : 13,635.43 = 5,404.61 : x
2. Step 2: Convert to fraction form
   9,880.96/13,635.43 = 5,404.61/x
3. Step 3: Cross multiply
   9,880.96x = 13,635.43 × 5,404.61
4. Step 4: Simplify right side
   9,880.96x = 73,694,201.91
5. Step 5: Solve for x
   x = 73,694,201.91/9,880.96
6. Step 6: Final answer
   x = 7,458.20