Finding the Fourth Proportional to 1,721.12, 2,375.88 and 1,022.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.12 : 2,375.88 = 1,022.72 : x
2. Step 2: Convert to fraction form
   1,721.12/2,375.88 = 1,022.72/x
3. Step 3: Cross multiply
   1,721.12x = 2,375.88 × 1,022.72
4. Step 4: Simplify right side
   1,721.12x = 2,429,859.99
5. Step 5: Solve for x
   x = 2,429,859.99/1,721.12
6. Step 6: Final answer
   x = 1,411.79