Finding the Fourth Proportional to 9,978.78, 13,770.41 and 5,502.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.78 : 13,770.41 = 5,502.45 : x
2. Step 2: Convert to fraction form
   9,978.78/13,770.41 = 5,502.45/x
3. Step 3: Cross multiply
   9,978.78x = 13,770.41 × 5,502.45
4. Step 4: Simplify right side
   9,978.78x = 75,770,964.99
5. Step 5: Solve for x
   x = 75,770,964.99/9,978.78
6. Step 6: Final answer
   x = 7,593.21