Finding the Fourth Proportional to 2,769.12, 4,151.39 and 1,380.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,769.12 : 4,151.39 = 1,380.78 : x
2. Step 2: Convert to fraction form
   2,769.12/4,151.39 = 1,380.78/x
3. Step 3: Cross multiply
   2,769.12x = 4,151.39 × 1,380.78
4. Step 4: Simplify right side
   2,769.12x = 5,732,149.38
5. Step 5: Solve for x
   x = 5,732,149.38/2,769.12
6. Step 6: Final answer
   x = 2,070.03