Finding the Fourth Proportional to 1,081.86, 1,492.99 and 662.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.86 : 1,492.99 = 662.20 : x
2. Step 2: Convert to fraction form
   1,081.86/1,492.99 = 662.20/x
3. Step 3: Cross multiply
   1,081.86x = 1,492.99 × 662.20
4. Step 4: Simplify right side
   1,081.86x = 988,667.74
5. Step 5: Solve for x
   x = 988,667.74/1,081.86
6. Step 6: Final answer
   x = 913.86