Finding the Fourth Proportional to 1,721.40, 2,375.48 and 935.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.40 : 2,375.48 = 935.42 : x
2. Step 2: Convert to fraction form
   1,721.40/2,375.48 = 935.42/x
3. Step 3: Cross multiply
   1,721.40x = 2,375.48 × 935.42
4. Step 4: Simplify right side
   1,721.40x = 2,222,071.50
5. Step 5: Solve for x
   x = 2,222,071.50/1,721.40
6. Step 6: Final answer
   x = 1,290.85