Finding the Fourth Proportional to 2,674.15, 4,005.16 and 1,288.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,674.15 : 4,005.16 = 1,288.48 : x
2. Step 2: Convert to fraction form
   2,674.15/4,005.16 = 1,288.48/x
3. Step 3: Cross multiply
   2,674.15x = 4,005.16 × 1,288.48
4. Step 4: Simplify right side
   2,674.15x = 5,160,548.53
5. Step 5: Solve for x
   x = 5,160,548.53/2,674.15
6. Step 6: Final answer
   x = 1,929.79