Finding the Fourth Proportional to 2,664.27, 3,996.77 and 1,278.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,664.27 : 3,996.77 = 1,278.29 : x
2. Step 2: Convert to fraction form
   2,664.27/3,996.77 = 1,278.29/x
3. Step 3: Cross multiply
   2,664.27x = 3,996.77 × 1,278.29
4. Step 4: Simplify right side
   2,664.27x = 5,109,004.75
5. Step 5: Solve for x
   x = 5,109,004.75/2,664.27
6. Step 6: Final answer
   x = 1,917.60