Finding the Fourth Proportional to 2,222.31, 3,066.81 and 1,278.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,222.31 : 3,066.81 = 1,278.12 : x
2. Step 2: Convert to fraction form
   2,222.31/3,066.81 = 1,278.12/x
3. Step 3: Cross multiply
   2,222.31x = 3,066.81 × 1,278.12
4. Step 4: Simplify right side
   2,222.31x = 3,919,751.20
5. Step 5: Solve for x
   x = 3,919,751.20/2,222.31
6. Step 6: Final answer
   x = 1,763.82