Finding the Fourth Proportional to 1,618.89, 2,233.89 and 920.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.89 : 2,233.89 = 920.13 : x
2. Step 2: Convert to fraction form
   1,618.89/2,233.89 = 920.13/x
3. Step 3: Cross multiply
   1,618.89x = 2,233.89 × 920.13
4. Step 4: Simplify right side
   1,618.89x = 2,055,469.21
5. Step 5: Solve for x
   x = 2,055,469.21/1,618.89
6. Step 6: Final answer
   x = 1,269.68