Finding the Fourth Proportional to 1,686.72, 2,326.42 and 1,267.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.72 : 2,326.42 = 1,267.09 : x
2. Step 2: Convert to fraction form
   1,686.72/2,326.42 = 1,267.09/x
3. Step 3: Cross multiply
   1,686.72x = 2,326.42 × 1,267.09
4. Step 4: Simplify right side
   1,686.72x = 2,947,792.37
5. Step 5: Solve for x
   x = 2,947,792.37/1,686.72
6. Step 6: Final answer
   x = 1,747.64