Finding the Fourth Proportional to 10,353.42, 15,517.17 and 5,160.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,353.42 : 15,517.17 = 5,160.78 : x
2. Step 2: Convert to fraction form
   10,353.42/15,517.17 = 5,160.78/x
3. Step 3: Cross multiply
   10,353.42x = 15,517.17 × 5,160.78
4. Step 4: Simplify right side
   10,353.42x = 80,080,700.59
5. Step 5: Solve for x
   x = 80,080,700.59/10,353.42
6. Step 6: Final answer
   x = 7,734.71