Finding the Fourth Proportional to 1,531.69, 2,113.69 and 868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,531.69 : 2,113.69 = 868.50 : x
2. Step 2: Convert to fraction form
   1,531.69/2,113.69 = 868.50/x
3. Step 3: Cross multiply
   1,531.69x = 2,113.69 × 868.50
4. Step 4: Simplify right side
   1,531.69x = 1,835,739.77
5. Step 5: Solve for x
   x = 1,835,739.77/1,531.69
6. Step 6: Final answer
   x = 1,198.51