Finding the Fourth Proportional to 1,434.77, 1,980.15 and 805.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.77 : 1,980.15 = 805.47 : x
2. Step 2: Convert to fraction form
   1,434.77/1,980.15 = 805.47/x
3. Step 3: Cross multiply
   1,434.77x = 1,980.15 × 805.47
4. Step 4: Simplify right side
   1,434.77x = 1,594,951.42
5. Step 5: Solve for x
   x = 1,594,951.42/1,434.77
6. Step 6: Final answer
   x = 1,111.64