Finding the Fourth Proportional to 2,855.86, 3,940.45 and 1,807.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,855.86 : 3,940.45 = 1,807.31 : x
2. Step 2: Convert to fraction form
   2,855.86/3,940.45 = 1,807.31/x
3. Step 3: Cross multiply
   2,855.86x = 3,940.45 × 1,807.31
4. Step 4: Simplify right side
   2,855.86x = 7,121,620.02
5. Step 5: Solve for x
   x = 7,121,620.02/2,855.86
6. Step 6: Final answer
   x = 2,493.69