Finding the Fourth Proportional to 1,281.59, 1,768.72 and 784.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,281.59 : 1,768.72 = 784.56 : x
2. Step 2: Convert to fraction form
   1,281.59/1,768.72 = 784.56/x
3. Step 3: Cross multiply
   1,281.59x = 1,768.72 × 784.56
4. Step 4: Simplify right side
   1,281.59x = 1,387,662.78
5. Step 5: Solve for x
   x = 1,387,662.78/1,281.59
6. Step 6: Final answer
   x = 1,082.77