Finding the Fourth Proportional to 1,081.36, 1,492.27 and 615.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.36 : 1,492.27 = 615.61 : x
2. Step 2: Convert to fraction form
   1,081.36/1,492.27 = 615.61/x
3. Step 3: Cross multiply
   1,081.36x = 1,492.27 × 615.61
4. Step 4: Simplify right side
   1,081.36x = 918,656.33
5. Step 5: Solve for x
   x = 918,656.33/1,081.36
6. Step 6: Final answer
   x = 849.54