Finding the Fourth Proportional to 2,273.12, 3,136.18 and 1,278.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,273.12 : 3,136.18 = 1,278.20 : x
2. Step 2: Convert to fraction form
   2,273.12/3,136.18 = 1,278.20/x
3. Step 3: Cross multiply
   2,273.12x = 3,136.18 × 1,278.20
4. Step 4: Simplify right side
   2,273.12x = 4,008,665.28
5. Step 5: Solve for x
   x = 4,008,665.28/2,273.12
6. Step 6: Final answer
   x = 1,763.51