Finding the Fourth Proportional to 2,101.31, 3,151.69 and 868.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.31 : 3,151.69 = 868.56 : x
2. Step 2: Convert to fraction form
   2,101.31/3,151.69 = 868.56/x
3. Step 3: Cross multiply
   2,101.31x = 3,151.69 × 868.56
4. Step 4: Simplify right side
   2,101.31x = 2,737,416.11
5. Step 5: Solve for x
   x = 2,737,416.11/2,101.31
6. Step 6: Final answer
   x = 1,302.72