Finding the Fourth Proportional to 9,880.52, 13,635.06 and 5,404.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.52 : 13,635.06 = 5,404.20 : x
2. Step 2: Convert to fraction form
   9,880.52/13,635.06 = 5,404.20/x
3. Step 3: Cross multiply
   9,880.52x = 13,635.06 × 5,404.20
4. Step 4: Simplify right side
   9,880.52x = 73,686,591.25
5. Step 5: Solve for x
   x = 73,686,591.25/9,880.52
6. Step 6: Final answer
   x = 7,457.76