Finding the Fourth Proportional to 1,605.78, 2,215.32 and 1,081.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.78 : 2,215.32 = 1,081.98 : x
2. Step 2: Convert to fraction form
   1,605.78/2,215.32 = 1,081.98/x
3. Step 3: Cross multiply
   1,605.78x = 2,215.32 × 1,081.98
4. Step 4: Simplify right side
   1,605.78x = 2,396,931.93
5. Step 5: Solve for x
   x = 2,396,931.93/1,605.78
6. Step 6: Final answer
   x = 1,492.69