Finding the Fourth Proportional to 1,081.68, 1,492.77 and 661.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.68 : 1,492.77 = 661.95 : x
2. Step 2: Convert to fraction form
   1,081.68/1,492.77 = 661.95/x
3. Step 3: Cross multiply
   1,081.68x = 1,492.77 × 661.95
4. Step 4: Simplify right side
   1,081.68x = 988,139.10
5. Step 5: Solve for x
   x = 988,139.10/1,081.68
6. Step 6: Final answer
   x = 913.52