Finding the Fourth Proportional to 9,978.98, 13,770.80 and 5,503.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.98 : 13,770.80 = 5,503.15 : x
2. Step 2: Convert to fraction form
   9,978.98/13,770.80 = 5,503.15/x
3. Step 3: Cross multiply
   9,978.98x = 13,770.80 × 5,503.15
4. Step 4: Simplify right side
   9,978.98x = 75,782,710.89
5. Step 5: Solve for x
   x = 75,782,710.89/9,978.98
6. Step 6: Final answer
   x = 7,594.23