Finding the Fourth Proportional to 9,978.78, 13,770.16 and 5,502.52

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.78 : 13,770.16 = 5,502.52 : x
2. Step 2: Convert to fraction form
   9,978.78/13,770.16 = 5,502.52/x
3. Step 3: Cross multiply
   9,978.78x = 13,770.16 × 5,502.52
4. Step 4: Simplify right side
   9,978.78x = 75,770,580.80
5. Step 5: Solve for x
   x = 75,770,580.80/9,978.78
6. Step 6: Final answer
   x = 7,593.17