Finding the Fourth Proportional to 1,081.56, 1,492.57 and 615.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.56 : 1,492.57 = 615.81 : x
2. Step 2: Convert to fraction form
   1,081.56/1,492.57 = 615.81/x
3. Step 3: Cross multiply
   1,081.56x = 1,492.57 × 615.81
4. Step 4: Simplify right side
   1,081.56x = 919,139.53
5. Step 5: Solve for x
   x = 919,139.53/1,081.56
6. Step 6: Final answer
   x = 849.83