Finding the Fourth Proportional to 1,720.62, 2,374.49 and 1,057.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.62 : 2,374.49 = 1,057.10 : x
2. Step 2: Convert to fraction form
   1,720.62/2,374.49 = 1,057.10/x
3. Step 3: Cross multiply
   1,720.62x = 2,374.49 × 1,057.10
4. Step 4: Simplify right side
   1,720.62x = 2,510,064.15
5. Step 5: Solve for x
   x = 2,510,064.15/1,720.62
6. Step 6: Final answer
   x = 1,458.81