Finding the Fourth Proportional to 2,336.72, 3,224.66 and 1,288.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,336.72 : 3,224.66 = 1,288.78 : x
2. Step 2: Convert to fraction form
   2,336.72/3,224.66 = 1,288.78/x
3. Step 3: Cross multiply
   2,336.72x = 3,224.66 × 1,288.78
4. Step 4: Simplify right side
   2,336.72x = 4,155,862.81
5. Step 5: Solve for x
   x = 4,155,862.81/2,336.72
6. Step 6: Final answer
   x = 1,778.51