Finding the Fourth Proportional to 2,080.54, 3,122.06 and 830.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.54 : 3,122.06 = 830.91 : x
2. Step 2: Convert to fraction form
   2,080.54/3,122.06 = 830.91/x
3. Step 3: Cross multiply
   2,080.54x = 3,122.06 × 830.91
4. Step 4: Simplify right side
   2,080.54x = 2,594,146.72
5. Step 5: Solve for x
   x = 2,594,146.72/2,080.54
6. Step 6: Final answer
   x = 1,246.86