Finding the Fourth Proportional to 2,806.49, 3,870.98 and 1,812.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,806.49 : 3,870.98 = 1,812.15 : x
2. Step 2: Convert to fraction form
   2,806.49/3,870.98 = 1,812.15/x
3. Step 3: Cross multiply
   2,806.49x = 3,870.98 × 1,812.15
4. Step 4: Simplify right side
   2,806.49x = 7,014,796.41
5. Step 5: Solve for x
   x = 7,014,796.41/2,806.49
6. Step 6: Final answer
   x = 2,499.49