Finding the Fourth Proportional to 1,531.84, 2,113.80 and 868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.84 : 2,113.80 = 868.72 : x
2. Step 2: Convert to fraction form
   1,531.84/2,113.80 = 868.72/x
3. Step 3: Cross multiply
   1,531.84x = 2,113.80 × 868.72
4. Step 4: Simplify right side
   1,531.84x = 1,836,300.34
5. Step 5: Solve for x
   x = 1,836,300.34/1,531.84
6. Step 6: Final answer
   x = 1,198.75