Finding the Fourth Proportional to 9,980.61, 13,773.06 and 5,504.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.61 : 13,773.06 = 5,504.78 : x
2. Step 2: Convert to fraction form
   9,980.61/13,773.06 = 5,504.78/x
3. Step 3: Cross multiply
   9,980.61x = 13,773.06 × 5,504.78
4. Step 4: Simplify right side
   9,980.61x = 75,817,665.23
5. Step 5: Solve for x
   x = 75,817,665.23/9,980.61
6. Step 6: Final answer
   x = 7,596.50