Finding the Fourth Proportional to 2,345.91, 3,517.91 and 864.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,345.91 : 3,517.91 = 864.78 : x
2. Step 2: Convert to fraction form
   2,345.91/3,517.91 = 864.78/x
3. Step 3: Cross multiply
   2,345.91x = 3,517.91 × 864.78
4. Step 4: Simplify right side
   2,345.91x = 3,042,228.59
5. Step 5: Solve for x
   x = 3,042,228.59/2,345.91
6. Step 6: Final answer
   x = 1,296.82