Finding the Fourth Proportional to 2,805.86, 3,871.32 and 1,811.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.86 : 3,871.32 = 1,811.46 : x
2. Step 2: Convert to fraction form
   2,805.86/3,871.32 = 1,811.46/x
3. Step 3: Cross multiply
   2,805.86x = 3,871.32 × 1,811.46
4. Step 4: Simplify right side
   2,805.86x = 7,012,741.33
5. Step 5: Solve for x
   x = 7,012,741.33/2,805.86
6. Step 6: Final answer
   x = 2,499.32