Finding the Fourth Proportional to 1,434.96, 1,980.20 and 805.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.96 : 1,980.20 = 805.43 : x
2. Step 2: Convert to fraction form
   1,434.96/1,980.20 = 805.43/x
3. Step 3: Cross multiply
   1,434.96x = 1,980.20 × 805.43
4. Step 4: Simplify right side
   1,434.96x = 1,594,919.45
5. Step 5: Solve for x
   x = 1,594,919.45/1,434.96
6. Step 6: Final answer
   x = 1,111.47