Finding the Fourth Proportional to 1,721.31, 2,570.30 and 1,351.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.31 : 2,570.30 = 1,351.95 : x
2. Step 2: Convert to fraction form
   1,721.31/2,570.30 = 1,351.95/x
3. Step 3: Cross multiply
   1,721.31x = 2,570.30 × 1,351.95
4. Step 4: Simplify right side
   1,721.31x = 3,474,910.33
5. Step 5: Solve for x
   x = 3,474,910.33/1,721.31
6. Step 6: Final answer
   x = 2,018.76