Finding the Fourth Proportional to 1,720.32, 2,581.71 and 1,331.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.32 : 2,581.71 = 1,331.29 : x
2. Step 2: Convert to fraction form
   1,720.32/2,581.71 = 1,331.29/x
3. Step 3: Cross multiply
   1,720.32x = 2,581.71 × 1,331.29
4. Step 4: Simplify right side
   1,720.32x = 3,437,004.71
5. Step 5: Solve for x
   x = 3,437,004.71/1,720.32
6. Step 6: Final answer
   x = 1,997.89