Finding the Fourth Proportional to 1,661.55, 2,492.48 and 839.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.55 : 2,492.48 = 839.30 : x
2. Step 2: Convert to fraction form
   1,661.55/2,492.48 = 839.30/x
3. Step 3: Cross multiply
   1,661.55x = 2,492.48 × 839.30
4. Step 4: Simplify right side
   1,661.55x = 2,091,934.27
5. Step 5: Solve for x
   x = 2,091,934.27/1,661.55
6. Step 6: Final answer
   x = 1,259.03