Finding the Fourth Proportional to 1,908.72, 2,863.20 and 738.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,908.72 : 2,863.20 = 738.72 : x
2. Step 2: Convert to fraction form
   1,908.72/2,863.20 = 738.72/x
3. Step 3: Cross multiply
   1,908.72x = 2,863.20 × 738.72
4. Step 4: Simplify right side
   1,908.72x = 2,115,103.10
5. Step 5: Solve for x
   x = 2,115,103.10/1,908.72
6. Step 6: Final answer
   x = 1,108.13