Finding the Fourth Proportional to 1,615.53, 2,227.91 and 1,085.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.53 : 2,227.91 = 1,085.61 : x
2. Step 2: Convert to fraction form
   1,615.53/2,227.91 = 1,085.61/x
3. Step 3: Cross multiply
   1,615.53x = 2,227.91 × 1,085.61
4. Step 4: Simplify right side
   1,615.53x = 2,418,635.95
5. Step 5: Solve for x
   x = 2,418,635.95/1,615.53
6. Step 6: Final answer
   x = 1,497.12