Finding the Fourth Proportional to 2,713.38, 4,070.69 and 864.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,713.38 : 4,070.69 = 864.60 : x
2. Step 2: Convert to fraction form
   2,713.38/4,070.69 = 864.60/x
3. Step 3: Cross multiply
   2,713.38x = 4,070.69 × 864.60
4. Step 4: Simplify right side
   2,713.38x = 3,519,526.59
5. Step 5: Solve for x
   x = 3,519,526.59/2,713.38
6. Step 6: Final answer
   x = 1,297.10