Finding the Fourth Proportional to 2,660.72, 3,988.37 and 1,272.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.72 : 3,988.37 = 1,272.02 : x
2. Step 2: Convert to fraction form
   2,660.72/3,988.37 = 1,272.02/x
3. Step 3: Cross multiply
   2,660.72x = 3,988.37 × 1,272.02
4. Step 4: Simplify right side
   2,660.72x = 5,073,269.65
5. Step 5: Solve for x
   x = 5,073,269.65/2,660.72
6. Step 6: Final answer
   x = 1,906.73