Finding the Fourth Proportional to 9,979.98, 13,772.18 and 5,504.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,979.98 : 13,772.18 = 5,504.15 : x
2. Step 2: Convert to fraction form
   9,979.98/13,772.18 = 5,504.15/x
3. Step 3: Cross multiply
   9,979.98x = 13,772.18 × 5,504.15
4. Step 4: Simplify right side
   9,979.98x = 75,804,144.55
5. Step 5: Solve for x
   x = 75,804,144.55/9,979.98
6. Step 6: Final answer
   x = 7,595.62