Finding the Fourth Proportional to 9,980.79, 13,774.12 and 5,504.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.79 : 13,774.12 = 5,504.55 : x
2. Step 2: Convert to fraction form
   9,980.79/13,774.12 = 5,504.55/x
3. Step 3: Cross multiply
   9,980.79x = 13,774.12 × 5,504.55
4. Step 4: Simplify right side
   9,980.79x = 75,820,235.85
5. Step 5: Solve for x
   x = 75,820,235.85/9,980.79
6. Step 6: Final answer
   x = 7,596.62