Finding the Fourth Proportional to 12,475.78, 17,215.89 and 7,760.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,475.78 : 17,215.89 = 7,760.02 : x
2. Step 2: Convert to fraction form
   12,475.78/17,215.89 = 7,760.02/x
3. Step 3: Cross multiply
   12,475.78x = 17,215.89 × 7,760.02
4. Step 4: Simplify right side
   12,475.78x = 133,595,650.72
5. Step 5: Solve for x
   x = 133,595,650.72/12,475.78
6. Step 6: Final answer
   x = 10,708.40