Finding the Fourth Proportional to 9,978.92, 13,771.49 and 5,503.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.92 : 13,771.49 = 5,503.62 : x
2. Step 2: Convert to fraction form
   9,978.92/13,771.49 = 5,503.62/x
3. Step 3: Cross multiply
   9,978.92x = 13,771.49 × 5,503.62
4. Step 4: Simplify right side
   9,978.92x = 75,793,020.28
5. Step 5: Solve for x
   x = 75,793,020.28/9,978.92
6. Step 6: Final answer
   x = 7,595.32