Finding the Fourth Proportional to 1,870.36, 2,581.61 and 1,280.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.36 : 2,581.61 = 1,280.77 : x
2. Step 2: Convert to fraction form
   1,870.36/2,581.61 = 1,280.77/x
3. Step 3: Cross multiply
   1,870.36x = 2,581.61 × 1,280.77
4. Step 4: Simplify right side
   1,870.36x = 3,306,435.78
5. Step 5: Solve for x
   x = 3,306,435.78/1,870.36
6. Step 6: Final answer
   x = 1,767.81