Finding the Fourth Proportional to 682,060.50, 1,023,238.17 and 261,336.78

Step by Step Solution

1. Step 1: Write the proportion equation
   682,060.50 : 1,023,238.17 = 261,336.78 : x
2. Step 2: Convert to fraction form
   682,060.50/1,023,238.17 = 261,336.78/x
3. Step 3: Cross multiply
   682,060.50x = 1,023,238.17 × 261,336.78
4. Step 4: Simplify right side
   682,060.50x = 267,409,768,520.89
5. Step 5: Solve for x
   x = 267,409,768,520.89/682,060.50
6. Step 6: Final answer
   x = 392,061.66