Finding the Fourth Proportional to 1,531.63, 2,113.86 and 868.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.63 : 2,113.86 = 868.75 : x
2. Step 2: Convert to fraction form
   1,531.63/2,113.86 = 868.75/x
3. Step 3: Cross multiply
   1,531.63x = 2,113.86 × 868.75
4. Step 4: Simplify right side
   1,531.63x = 1,836,415.88
5. Step 5: Solve for x
   x = 1,836,415.88/1,531.63
6. Step 6: Final answer
   x = 1,198.99