Finding the Fourth Proportional to 9,880.61, 13,634.93 and 5,404.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.61 : 13,634.93 = 5,404.25 : x
2. Step 2: Convert to fraction form
   9,880.61/13,634.93 = 5,404.25/x
3. Step 3: Cross multiply
   9,880.61x = 13,634.93 × 5,404.25
4. Step 4: Simplify right side
   9,880.61x = 73,686,618.05
5. Step 5: Solve for x
   x = 73,686,618.05/9,880.61
6. Step 6: Final answer
   x = 7,457.70