Finding the Fourth Proportional to 2,786.72, 4,180.52 and 838.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,786.72 : 4,180.52 = 838.68 : x
2. Step 2: Convert to fraction form
   2,786.72/4,180.52 = 838.68/x
3. Step 3: Cross multiply
   2,786.72x = 4,180.52 × 838.68
4. Step 4: Simplify right side
   2,786.72x = 3,506,118.51
5. Step 5: Solve for x
   x = 3,506,118.51/2,786.72
6. Step 6: Final answer
   x = 1,258.15