Finding the Fourth Proportional to 1,531.72, 2,113.74 and 868.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.72 : 2,113.74 = 868.56 : x
2. Step 2: Convert to fraction form
   1,531.72/2,113.74 = 868.56/x
3. Step 3: Cross multiply
   1,531.72x = 2,113.74 × 868.56
4. Step 4: Simplify right side
   1,531.72x = 1,835,910.01
5. Step 5: Solve for x
   x = 1,835,910.01/1,531.72
6. Step 6: Final answer
   x = 1,198.59