Finding the Fourth Proportional to 2,931.86, 4,397.06 and 851.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.86 : 4,397.06 = 851.42 : x
2. Step 2: Convert to fraction form
   2,931.86/4,397.06 = 851.42/x
3. Step 3: Cross multiply
   2,931.86x = 4,397.06 × 851.42
4. Step 4: Simplify right side
   2,931.86x = 3,743,744.83
5. Step 5: Solve for x
   x = 3,743,744.83/2,931.86
6. Step 6: Final answer
   x = 1,276.92