Finding the Fourth Proportional to 2,713.79, 4,070.72 and 864.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,713.79 : 4,070.72 = 864.90 : x
2. Step 2: Convert to fraction form
   2,713.79/4,070.72 = 864.90/x
3. Step 3: Cross multiply
   2,713.79x = 4,070.72 × 864.90
4. Step 4: Simplify right side
   2,713.79x = 3,520,767.89
5. Step 5: Solve for x
   x = 3,520,767.89/2,713.79
6. Step 6: Final answer
   x = 1,297.36