Finding the Fourth Proportional to 1,540.79, 2,126.47 and 868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.79 : 2,126.47 = 868.72 : x
2. Step 2: Convert to fraction form
   1,540.79/2,126.47 = 868.72/x
3. Step 3: Cross multiply
   1,540.79x = 2,126.47 × 868.72
4. Step 4: Simplify right side
   1,540.79x = 1,847,313.52
5. Step 5: Solve for x
   x = 1,847,313.52/1,540.79
6. Step 6: Final answer
   x = 1,198.94