Finding the Fourth Proportional to 1,446.72, 1,996.46 and 783.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,446.72 : 1,996.46 = 783.57 : x
2. Step 2: Convert to fraction form
   1,446.72/1,996.46 = 783.57/x
3. Step 3: Cross multiply
   1,446.72x = 1,996.46 × 783.57
4. Step 4: Simplify right side
   1,446.72x = 1,564,352.26
5. Step 5: Solve for x
   x = 1,564,352.26/1,446.72
6. Step 6: Final answer
   x = 1,081.31