Finding the Fourth Proportional to 1,272.27, 1,764.72 and 1,238.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.27 : 1,764.72 = 1,238.55 : x
2. Step 2: Convert to fraction form
   1,272.27/1,764.72 = 1,238.55/x
3. Step 3: Cross multiply
   1,272.27x = 1,764.72 × 1,238.55
4. Step 4: Simplify right side
   1,272.27x = 2,185,693.96
5. Step 5: Solve for x
   x = 2,185,693.96/1,272.27
6. Step 6: Final answer
   x = 1,717.95