Finding the Fourth Proportional to 9,880.58, 13,634.88 and 5,404.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.58 : 13,634.88 = 5,404.40 : x
2. Step 2: Convert to fraction form
   9,880.58/13,634.88 = 5,404.40/x
3. Step 3: Cross multiply
   9,880.58x = 13,634.88 × 5,404.40
4. Step 4: Simplify right side
   9,880.58x = 73,688,345.47
5. Step 5: Solve for x
   x = 73,688,345.47/9,880.58
6. Step 6: Final answer
   x = 7,457.90