Finding the Fourth Proportional to 1,531.98, 2,114.20 and 868.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.98 : 2,114.20 = 868.86 : x
2. Step 2: Convert to fraction form
   1,531.98/2,114.20 = 868.86/x
3. Step 3: Cross multiply
   1,531.98x = 2,114.20 × 868.86
4. Step 4: Simplify right side
   1,531.98x = 1,836,943.81
5. Step 5: Solve for x
   x = 1,836,943.81/1,531.98
6. Step 6: Final answer
   x = 1,199.07