Finding the Fourth Proportional to 1,418.20, 1,956.78 and 920.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,418.20 : 1,956.78 = 920.79 : x
2. Step 2: Convert to fraction form
   1,418.20/1,956.78 = 920.79/x
3. Step 3: Cross multiply
   1,418.20x = 1,956.78 × 920.79
4. Step 4: Simplify right side
   1,418.20x = 1,801,783.46
5. Step 5: Solve for x
   x = 1,801,783.46/1,418.20
6. Step 6: Final answer
   x = 1,270.47