Finding the Fourth Proportional to 1,689.72, 2,330.56 and 1,270.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.72 : 2,330.56 = 1,270.09 : x
2. Step 2: Convert to fraction form
   1,689.72/2,330.56 = 1,270.09/x
3. Step 3: Cross multiply
   1,689.72x = 2,330.56 × 1,270.09
4. Step 4: Simplify right side
   1,689.72x = 2,960,020.95
5. Step 5: Solve for x
   x = 2,960,020.95/1,689.72
6. Step 6: Final answer
   x = 1,751.78