Finding the Fourth Proportional to 9,980.55, 13,773.78 and 5,504.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.55 : 13,773.78 = 5,504.30 : x
2. Step 2: Convert to fraction form
   9,980.55/13,773.78 = 5,504.30/x
3. Step 3: Cross multiply
   9,980.55x = 13,773.78 × 5,504.30
4. Step 4: Simplify right side
   9,980.55x = 75,814,948.39
5. Step 5: Solve for x
   x = 75,814,948.39/9,980.55
6. Step 6: Final answer
   x = 7,596.27