Finding the Fourth Proportional to 1,434.59, 1,979.87 and 805.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.59 : 1,979.87 = 805.12 : x
2. Step 2: Convert to fraction form
   1,434.59/1,979.87 = 805.12/x
3. Step 3: Cross multiply
   1,434.59x = 1,979.87 × 805.12
4. Step 4: Simplify right side
   1,434.59x = 1,594,023.27
5. Step 5: Solve for x
   x = 1,594,023.27/1,434.59
6. Step 6: Final answer
   x = 1,111.14