Finding the Fourth Proportional to 2,080.38, 2,870.55 and 1,240.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.38 : 2,870.55 = 1,240.77 : x
2. Step 2: Convert to fraction form
   2,080.38/2,870.55 = 1,240.77/x
3. Step 3: Cross multiply
   2,080.38x = 2,870.55 × 1,240.77
4. Step 4: Simplify right side
   2,080.38x = 3,561,692.32
5. Step 5: Solve for x
   x = 3,561,692.32/2,080.38
6. Step 6: Final answer
   x = 1,712.04