Finding the Fourth Proportional to 2,623.89, 3,936.32 and 868.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,623.89 : 3,936.32 = 868.91 : x
2. Step 2: Convert to fraction form
   2,623.89/3,936.32 = 868.91/x
3. Step 3: Cross multiply
   2,623.89x = 3,936.32 × 868.91
4. Step 4: Simplify right side
   2,623.89x = 3,420,307.81
5. Step 5: Solve for x
   x = 3,420,307.81/2,623.89
6. Step 6: Final answer
   x = 1,303.53