Finding the Fourth Proportional to 1,434.92, 1,980.02 and 805.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.92 : 1,980.02 = 805.31 : x
2. Step 2: Convert to fraction form
   1,434.92/1,980.02 = 805.31/x
3. Step 3: Cross multiply
   1,434.92x = 1,980.02 × 805.31
4. Step 4: Simplify right side
   1,434.92x = 1,594,515.98
5. Step 5: Solve for x
   x = 1,594,515.98/1,434.92
6. Step 6: Final answer
   x = 1,111.23