Finding the Fourth Proportional to 1,434.56, 1,979.79 and 805.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.56 : 1,979.79 = 805.15 : x
2. Step 2: Convert to fraction form
   1,434.56/1,979.79 = 805.15/x
3. Step 3: Cross multiply
   1,434.56x = 1,979.79 × 805.15
4. Step 4: Simplify right side
   1,434.56x = 1,594,027.92
5. Step 5: Solve for x
   x = 1,594,027.92/1,434.56
6. Step 6: Final answer
   x = 1,111.16