Finding the Fourth Proportional to 10,082.78, 15,124.20 and 3,507.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,082.78 : 15,124.20 = 3,507.40 : x
2. Step 2: Convert to fraction form
   10,082.78/15,124.20 = 3,507.40/x
3. Step 3: Cross multiply
   10,082.78x = 15,124.20 × 3,507.40
4. Step 4: Simplify right side
   10,082.78x = 53,046,525.92
5. Step 5: Solve for x
   x = 53,046,525.92/10,082.78
6. Step 6: Final answer
   x = 5,261.10