Finding the Fourth Proportional to 1,434.88, 1,980.12 and 805.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.88 : 1,980.12 = 805.42 : x
2. Step 2: Convert to fraction form
   1,434.88/1,980.12 = 805.42/x
3. Step 3: Cross multiply
   1,434.88x = 1,980.12 × 805.42
4. Step 4: Simplify right side
   1,434.88x = 1,594,828.25
5. Step 5: Solve for x
   x = 1,594,828.25/1,434.88
6. Step 6: Final answer
   x = 1,111.47