Finding the Fourth Proportional to 1,321.57, 1,826.31 and 1,085.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.57 : 1,826.31 = 1,085.08 : x
2. Step 2: Convert to fraction form
   1,321.57/1,826.31 = 1,085.08/x
3. Step 3: Cross multiply
   1,321.57x = 1,826.31 × 1,085.08
4. Step 4: Simplify right side
   1,321.57x = 1,981,692.45
5. Step 5: Solve for x
   x = 1,981,692.45/1,321.57
6. Step 6: Final answer
   x = 1,499.50