Finding the Fourth Proportional to 9,478.67, 13,080.61 and 5,229.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,478.67 : 13,080.61 = 5,229.78 : x
2. Step 2: Convert to fraction form
   9,478.67/13,080.61 = 5,229.78/x
3. Step 3: Cross multiply
   9,478.67x = 13,080.61 × 5,229.78
4. Step 4: Simplify right side
   9,478.67x = 68,408,712.57
5. Step 5: Solve for x
   x = 68,408,712.57/9,478.67
6. Step 6: Final answer
   x = 7,217.12