Finding the Fourth Proportional to 1,224.72, 1,691.33 and 805.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,224.72 : 1,691.33 = 805.34 : x
2. Step 2: Convert to fraction form
   1,224.72/1,691.33 = 805.34/x
3. Step 3: Cross multiply
   1,224.72x = 1,691.33 × 805.34
4. Step 4: Simplify right side
   1,224.72x = 1,362,100.43
5. Step 5: Solve for x
   x = 1,362,100.43/1,224.72
6. Step 6: Final answer
   x = 1,112.17