Finding the Fourth Proportional to 2,222.79, 3,066.96 and 1,290.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,222.79 : 3,066.96 = 1,290.75 : x
2. Step 2: Convert to fraction form
   2,222.79/3,066.96 = 1,290.75/x
3. Step 3: Cross multiply
   2,222.79x = 3,066.96 × 1,290.75
4. Step 4: Simplify right side
   2,222.79x = 3,958,678.62
5. Step 5: Solve for x
   x = 3,958,678.62/2,222.79
6. Step 6: Final answer
   x = 1,780.95