Finding the Fourth Proportional to 1,605.98, 2,215.40 and 1,082.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.98 : 2,215.40 = 1,082.18 : x
2. Step 2: Convert to fraction form
   1,605.98/2,215.40 = 1,082.18/x
3. Step 3: Cross multiply
   1,605.98x = 2,215.40 × 1,082.18
4. Step 4: Simplify right side
   1,605.98x = 2,397,461.57
5. Step 5: Solve for x
   x = 2,397,461.57/1,605.98
6. Step 6: Final answer
   x = 1,492.83