Finding the Fourth Proportional to 1,434.94, 1,980.24 and 805.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.94 : 1,980.24 = 805.61 : x
2. Step 2: Convert to fraction form
   1,434.94/1,980.24 = 805.61/x
3. Step 3: Cross multiply
   1,434.94x = 1,980.24 × 805.61
4. Step 4: Simplify right side
   1,434.94x = 1,595,287.22
5. Step 5: Solve for x
   x = 1,595,287.22/1,434.94
6. Step 6: Final answer
   x = 1,111.74