Finding the Fourth Proportional to 2,860.80, 3,945.86 and 2,625.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.80 : 3,945.86 = 2,625.51 : x
2. Step 2: Convert to fraction form
   2,860.80/3,945.86 = 2,625.51/x
3. Step 3: Cross multiply
   2,860.80x = 3,945.86 × 2,625.51
4. Step 4: Simplify right side
   2,860.80x = 10,359,886.66
5. Step 5: Solve for x
   x = 10,359,886.66/2,860.80
6. Step 6: Final answer
   x = 3,621.33