Finding the Fourth Proportional to 1,081.42, 1,492.25 and 609.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.42 : 1,492.25 = 609.30 : x
2. Step 2: Convert to fraction form
   1,081.42/1,492.25 = 609.30/x
3. Step 3: Cross multiply
   1,081.42x = 1,492.25 × 609.30
4. Step 4: Simplify right side
   1,081.42x = 909,224.88
5. Step 5: Solve for x
   x = 909,224.88/1,081.42
6. Step 6: Final answer
   x = 840.77