Finding the Fourth Proportional to 1,057.91, 1,459.89 and 579.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.91 : 1,459.89 = 579.35 : x
2. Step 2: Convert to fraction form
   1,057.91/1,459.89 = 579.35/x
3. Step 3: Cross multiply
   1,057.91x = 1,459.89 × 579.35
4. Step 4: Simplify right side
   1,057.91x = 845,787.27
5. Step 5: Solve for x
   x = 845,787.27/1,057.91
6. Step 6: Final answer
   x = 799.49