Finding the Fourth Proportional to 1,434.93, 1,980.29 and 805.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.93 : 1,980.29 = 805.51 : x
2. Step 2: Convert to fraction form
   1,434.93/1,980.29 = 805.51/x
3. Step 3: Cross multiply
   1,434.93x = 1,980.29 × 805.51
4. Step 4: Simplify right side
   1,434.93x = 1,595,143.40
5. Step 5: Solve for x
   x = 1,595,143.40/1,434.93
6. Step 6: Final answer
   x = 1,111.65