Finding the Fourth Proportional to 1,618.38, 2,233.36 and 919.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.38 : 2,233.36 = 919.89 : x
2. Step 2: Convert to fraction form
   1,618.38/2,233.36 = 919.89/x
3. Step 3: Cross multiply
   1,618.38x = 2,233.36 × 919.89
4. Step 4: Simplify right side
   1,618.38x = 2,054,445.53
5. Step 5: Solve for x
   x = 2,054,445.53/1,618.38
6. Step 6: Final answer
   x = 1,269.45