Finding the Fourth Proportional to 2,805.94, 3,870 and 1,811.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.94 : 3,870 = 1,811.32 : x
2. Step 2: Convert to fraction form
   2,805.94/3,870 = 1,811.32/x
3. Step 3: Cross multiply
   2,805.94x = 3,870 × 1,811.32
4. Step 4: Simplify right side
   2,805.94x = 7,009,808.40
5. Step 5: Solve for x
   x = 7,009,808.40/2,805.94
6. Step 6: Final answer
   x = 2,498.20