Finding the Fourth Proportional to 1,722.72, 2,377.40 and 936.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,722.72 : 2,377.40 = 936.80 : x
2. Step 2: Convert to fraction form
   1,722.72/2,377.40 = 936.80/x
3. Step 3: Cross multiply
   1,722.72x = 2,377.40 × 936.80
4. Step 4: Simplify right side
   1,722.72x = 2,227,148.32
5. Step 5: Solve for x
   x = 2,227,148.32/1,722.72
6. Step 6: Final answer
   x = 1,292.81