Finding the Fourth Proportional to 2,677.35, 4,013.72 and 1,288.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,677.35 : 4,013.72 = 1,288.78 : x
2. Step 2: Convert to fraction form
   2,677.35/4,013.72 = 1,288.78/x
3. Step 3: Cross multiply
   2,677.35x = 4,013.72 × 1,288.78
4. Step 4: Simplify right side
   2,677.35x = 5,172,781.99
5. Step 5: Solve for x
   x = 5,172,781.99/2,677.35
6. Step 6: Final answer
   x = 1,932.05