Finding the Fourth Proportional to 1,081.49, 1,492.47 and 615.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.49 : 1,492.47 = 615.77 : x
2. Step 2: Convert to fraction form
   1,081.49/1,492.47 = 615.77/x
3. Step 3: Cross multiply
   1,081.49x = 1,492.47 × 615.77
4. Step 4: Simplify right side
   1,081.49x = 919,018.25
5. Step 5: Solve for x
   x = 919,018.25/1,081.49
6. Step 6: Final answer
   x = 849.77