Finding the Fourth Proportional to 2,087.94, 2,880.05 and 1,291.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.94 : 2,880.05 = 1,291.05 : x
2. Step 2: Convert to fraction form
   2,087.94/2,880.05 = 1,291.05/x
3. Step 3: Cross multiply
   2,087.94x = 2,880.05 × 1,291.05
4. Step 4: Simplify right side
   2,087.94x = 3,718,282.10
5. Step 5: Solve for x
   x = 3,718,282.10/2,087.94
6. Step 6: Final answer
   x = 1,780.84