Finding the Fourth Proportional to 9,955.49, 13,739.49 and 5,480.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,955.49 : 13,739.49 = 5,480.15 : x
2. Step 2: Convert to fraction form
   9,955.49/13,739.49 = 5,480.15/x
3. Step 3: Cross multiply
   9,955.49x = 13,739.49 × 5,480.15
4. Step 4: Simplify right side
   9,955.49x = 75,294,397.43
5. Step 5: Solve for x
   x = 75,294,397.43/9,955.49
6. Step 6: Final answer
   x = 7,563.11