Finding the Fourth Proportional to 1,131.50, 1,689.69 and 885.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.50 : 1,689.69 = 885.26 : x
2. Step 2: Convert to fraction form
   1,131.50/1,689.69 = 885.26/x
3. Step 3: Cross multiply
   1,131.50x = 1,689.69 × 885.26
4. Step 4: Simplify right side
   1,131.50x = 1,495,806.52
5. Step 5: Solve for x
   x = 1,495,806.52/1,131.50
6. Step 6: Final answer
   x = 1,321.97