Finding the Fourth Proportional to 1,281.92, 1,768.72 and 784.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.92 : 1,768.72 = 784.38 : x
2. Step 2: Convert to fraction form
   1,281.92/1,768.72 = 784.38/x
3. Step 3: Cross multiply
   1,281.92x = 1,768.72 × 784.38
4. Step 4: Simplify right side
   1,281.92x = 1,387,348.59
5. Step 5: Solve for x
   x = 1,387,348.59/1,281.92
6. Step 6: Final answer
   x = 1,082.24