Finding the Fourth Proportional to 1,531.29, 2,113.15 and 868.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.29 : 2,113.15 = 868.15 : x
2. Step 2: Convert to fraction form
   1,531.29/2,113.15 = 868.15/x
3. Step 3: Cross multiply
   1,531.29x = 2,113.15 × 868.15
4. Step 4: Simplify right side
   1,531.29x = 1,834,531.17
5. Step 5: Solve for x
   x = 1,834,531.17/1,531.29
6. Step 6: Final answer
   x = 1,198.03