Finding the Fourth Proportional to 2,267.31, 3,128.88 and 1,272.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,267.31 : 3,128.88 = 1,272.60 : x
2. Step 2: Convert to fraction form
   2,267.31/3,128.88 = 1,272.60/x
3. Step 3: Cross multiply
   2,267.31x = 3,128.88 × 1,272.60
4. Step 4: Simplify right side
   2,267.31x = 3,981,817.46
5. Step 5: Solve for x
   x = 3,981,817.46/2,267.31
6. Step 6: Final answer
   x = 1,756.18