Finding the Fourth Proportional to 2,859.86, 3,945.96 and 1,811.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.86 : 3,945.96 = 1,811.32 : x
2. Step 2: Convert to fraction form
   2,859.86/3,945.96 = 1,811.32/x
3. Step 3: Cross multiply
   2,859.86x = 3,945.96 × 1,811.32
4. Step 4: Simplify right side
   2,859.86x = 7,147,396.27
5. Step 5: Solve for x
   x = 7,147,396.27/2,859.86
6. Step 6: Final answer
   x = 2,499.21