Finding the Fourth Proportional to 3,106.72, 4,287.88 and 1,781.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,106.72 : 4,287.88 = 1,781.28 : x
2. Step 2: Convert to fraction form
   3,106.72/4,287.88 = 1,781.28/x
3. Step 3: Cross multiply
   3,106.72x = 4,287.88 × 1,781.28
4. Step 4: Simplify right side
   3,106.72x = 7,637,914.89
5. Step 5: Solve for x
   x = 7,637,914.89/3,106.72
6. Step 6: Final answer
   x = 2,458.51