Finding the Fourth Proportional to 1,618.56, 2,233.80 and 920.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.56 : 2,233.80 = 920.28 : x
2. Step 2: Convert to fraction form
   1,618.56/2,233.80 = 920.28/x
3. Step 3: Cross multiply
   1,618.56x = 2,233.80 × 920.28
4. Step 4: Simplify right side
   1,618.56x = 2,055,721.46
5. Step 5: Solve for x
   x = 2,055,721.46/1,618.56
6. Step 6: Final answer
   x = 1,270.09