Finding the Fourth Proportional to 2,119.87, 2,926.56 and 1,280.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,119.87 : 2,926.56 = 1,280.77 : x
2. Step 2: Convert to fraction form
   2,119.87/2,926.56 = 1,280.77/x
3. Step 3: Cross multiply
   2,119.87x = 2,926.56 × 1,280.77
4. Step 4: Simplify right side
   2,119.87x = 3,748,250.25
5. Step 5: Solve for x
   x = 3,748,250.25/2,119.87
6. Step 6: Final answer
   x = 1,768.15