Finding the Fourth Proportional to 1,057.96, 1,458.61 and 808.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.96 : 1,458.61 = 808.89 : x
2. Step 2: Convert to fraction form
   1,057.96/1,458.61 = 808.89/x
3. Step 3: Cross multiply
   1,057.96x = 1,458.61 × 808.89
4. Step 4: Simplify right side
   1,057.96x = 1,179,847.55
5. Step 5: Solve for x
   x = 1,179,847.55/1,057.96
6. Step 6: Final answer
   x = 1,115.21