Finding the Fourth Proportional to 2,816.90, 4,223.94 and 868.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,816.90 : 4,223.94 = 868.86 : x
2. Step 2: Convert to fraction form
   2,816.90/4,223.94 = 868.86/x
3. Step 3: Cross multiply
   2,816.90x = 4,223.94 × 868.86
4. Step 4: Simplify right side
   2,816.90x = 3,670,012.51
5. Step 5: Solve for x
   x = 3,670,012.51/2,816.90
6. Step 6: Final answer
   x = 1,302.86