Finding the Fourth Proportional to 1,721.56, 2,375.72 and 935.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.56 : 2,375.72 = 935.60 : x
2. Step 2: Convert to fraction form
   1,721.56/2,375.72 = 935.60/x
3. Step 3: Cross multiply
   1,721.56x = 2,375.72 × 935.60
4. Step 4: Simplify right side
   1,721.56x = 2,222,723.63
5. Step 5: Solve for x
   x = 2,222,723.63/1,721.56
6. Step 6: Final answer
   x = 1,291.11