Finding the Fourth Proportional to 2,081.95, 3,122.89 and 987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.95 : 3,122.89 = 987.10 : x
2. Step 2: Convert to fraction form
   2,081.95/3,122.89 = 987.10/x
3. Step 3: Cross multiply
   2,081.95x = 3,122.89 × 987.10
4. Step 4: Simplify right side
   2,081.95x = 3,082,594.44
5. Step 5: Solve for x
   x = 3,082,594.44/2,081.95
6. Step 6: Final answer
   x = 1,480.63