Finding the Fourth Proportional to 2,222.88, 3,066.72 and 1,291.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,222.88 : 3,066.72 = 1,291.20 : x
2. Step 2: Convert to fraction form
   2,222.88/3,066.72 = 1,291.20/x
3. Step 3: Cross multiply
   2,222.88x = 3,066.72 × 1,291.20
4. Step 4: Simplify right side
   2,222.88x = 3,959,748.86
5. Step 5: Solve for x
   x = 3,959,748.86/2,222.88
6. Step 6: Final answer
   x = 1,781.36