Finding the Fourth Proportional to 2,061.31, 3,091.20 and 1,280.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,061.31 : 3,091.20 = 1,280.17 : x
2. Step 2: Convert to fraction form
   2,061.31/3,091.20 = 1,280.17/x
3. Step 3: Cross multiply
   2,061.31x = 3,091.20 × 1,280.17
4. Step 4: Simplify right side
   2,061.31x = 3,957,261.50
5. Step 5: Solve for x
   x = 3,957,261.50/2,061.31
6. Step 6: Final answer
   x = 1,919.78