Finding the Fourth Proportional to 9,880.10, 13,634.55 and 5,404.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.10 : 13,634.55 = 5,404.28 : x
2. Step 2: Convert to fraction form
   9,880.10/13,634.55 = 5,404.28/x
3. Step 3: Cross multiply
   9,880.10x = 13,634.55 × 5,404.28
4. Step 4: Simplify right side
   9,880.10x = 73,684,857.70
5. Step 5: Solve for x
   x = 73,684,857.70/9,880.10
6. Step 6: Final answer
   x = 7,457.90