Finding the Fourth Proportional to 1,446.90, 1,996.72 and 783.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,446.90 : 1,996.72 = 783.76 : x
2. Step 2: Convert to fraction form
   1,446.90/1,996.72 = 783.76/x
3. Step 3: Cross multiply
   1,446.90x = 1,996.72 × 783.76
4. Step 4: Simplify right side
   1,446.90x = 1,564,946.06
5. Step 5: Solve for x
   x = 1,564,946.06/1,446.90
6. Step 6: Final answer
   x = 1,081.58