Finding the Fourth Proportional to 9,880, 13,634.78 and 5,404.08

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880 : 13,634.78 = 5,404.08 : x
2. Step 2: Convert to fraction form
   9,880/13,634.78 = 5,404.08/x
3. Step 3: Cross multiply
   9,880x = 13,634.78 × 5,404.08
4. Step 4: Simplify right side
   9,880x = 73,683,441.90
5. Step 5: Solve for x
   x = 73,683,441.90/9,880
6. Step 6: Final answer
   x = 7,457.84