Finding the Fourth Proportional to 2,081.30, 3,122.55 and 986.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.30 : 3,122.55 = 986.58 : x
2. Step 2: Convert to fraction form
   2,081.30/3,122.55 = 986.58/x
3. Step 3: Cross multiply
   2,081.30x = 3,122.55 × 986.58
4. Step 4: Simplify right side
   2,081.30x = 3,080,645.38
5. Step 5: Solve for x
   x = 3,080,645.38/2,081.30
6. Step 6: Final answer
   x = 1,480.16