Finding the Fourth Proportional to 1,057.91, 1,458.61 and 808.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.91 : 1,458.61 = 808.84 : x
2. Step 2: Convert to fraction form
   1,057.91/1,458.61 = 808.84/x
3. Step 3: Cross multiply
   1,057.91x = 1,458.61 × 808.84
4. Step 4: Simplify right side
   1,057.91x = 1,179,773.71
5. Step 5: Solve for x
   x = 1,179,773.71/1,057.91
6. Step 6: Final answer
   x = 1,115.19