Finding the Fourth Proportional to 1,531.40, 2,113.30 and 868.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.40 : 2,113.30 = 868.47 : x
2. Step 2: Convert to fraction form
   1,531.40/2,113.30 = 868.47/x
3. Step 3: Cross multiply
   1,531.40x = 2,113.30 × 868.47
4. Step 4: Simplify right side
   1,531.40x = 1,835,335.48
5. Step 5: Solve for x
   x = 1,835,335.48/1,531.40
6. Step 6: Final answer
   x = 1,198.47