Finding the Fourth Proportional to 2,100.89, 3,150.65 and 868.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.89 : 3,150.65 = 868.42 : x
2. Step 2: Convert to fraction form
   2,100.89/3,150.65 = 868.42/x
3. Step 3: Cross multiply
   2,100.89x = 3,150.65 × 868.42
4. Step 4: Simplify right side
   2,100.89x = 2,736,088.70
5. Step 5: Solve for x
   x = 2,736,088.70/2,100.89
6. Step 6: Final answer
   x = 1,302.35