Finding the Fourth Proportional to 1,081.91, 1,492.86 and 609.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.91 : 1,492.86 = 609.74 : x
2. Step 2: Convert to fraction form
   1,081.91/1,492.86 = 609.74/x
3. Step 3: Cross multiply
   1,081.91x = 1,492.86 × 609.74
4. Step 4: Simplify right side
   1,081.91x = 910,256.46
5. Step 5: Solve for x
   x = 910,256.46/1,081.91
6. Step 6: Final answer
   x = 841.34