Finding the Fourth Proportional to 2,267.12, 3,128.57 and 1,272.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,267.12 : 3,128.57 = 1,272.39 : x
2. Step 2: Convert to fraction form
   2,267.12/3,128.57 = 1,272.39/x
3. Step 3: Cross multiply
   2,267.12x = 3,128.57 × 1,272.39
4. Step 4: Simplify right side
   2,267.12x = 3,980,754.82
5. Step 5: Solve for x
   x = 3,980,754.82/2,267.12
6. Step 6: Final answer
   x = 1,755.87