Finding the Fourth Proportional to 1,268.72, 1,902.72 and 618.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,268.72 : 1,902.72 = 618.24 : x
2. Step 2: Convert to fraction form
   1,268.72/1,902.72 = 618.24/x
3. Step 3: Cross multiply
   1,268.72x = 1,902.72 × 618.24
4. Step 4: Simplify right side
   1,268.72x = 1,176,337.61
5. Step 5: Solve for x
   x = 1,176,337.61/1,268.72
6. Step 6: Final answer
   x = 927.18