Finding the Fourth Proportional to 2,945.20, 4,414.56 and 1,212.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,945.20 : 4,414.56 = 1,212.88 : x
2. Step 2: Convert to fraction form
   2,945.20/4,414.56 = 1,212.88/x
3. Step 3: Cross multiply
   2,945.20x = 4,414.56 × 1,212.88
4. Step 4: Simplify right side
   2,945.20x = 5,354,331.53
5. Step 5: Solve for x
   x = 5,354,331.53/2,945.20
6. Step 6: Final answer
   x = 1,817.99