Finding the Fourth Proportional to 1,720.89, 2,374.83 and 1,057.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,720.89 : 2,374.83 = 1,057.59 : x
2. Step 2: Convert to fraction form
   1,720.89/2,374.83 = 1,057.59/x
3. Step 3: Cross multiply
   1,720.89x = 2,374.83 × 1,057.59
4. Step 4: Simplify right side
   1,720.89x = 2,511,596.46
5. Step 5: Solve for x
   x = 2,511,596.46/1,720.89
6. Step 6: Final answer
   x = 1,459.48