Finding the Fourth Proportional to 1,721.67, 2,592.59 and 1,238.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.67 : 2,592.59 = 1,238.10 : x
2. Step 2: Convert to fraction form
   1,721.67/2,592.59 = 1,238.10/x
3. Step 3: Cross multiply
   1,721.67x = 2,592.59 × 1,238.10
4. Step 4: Simplify right side
   1,721.67x = 3,209,879.49
5. Step 5: Solve for x
   x = 3,209,879.49/1,721.67
6. Step 6: Final answer
   x = 1,864.40