Finding the Fourth Proportional to 2,278.20, 3,142.98 and 1,806.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,278.20 : 3,142.98 = 1,806.15 : x
2. Step 2: Convert to fraction form
   2,278.20/3,142.98 = 1,806.15/x
3. Step 3: Cross multiply
   2,278.20x = 3,142.98 × 1,806.15
4. Step 4: Simplify right side
   2,278.20x = 5,676,693.33
5. Step 5: Solve for x
   x = 5,676,693.33/2,278.20
6. Step 6: Final answer
   x = 2,491.74