Finding the Fourth Proportional to 1,308.72, 1,805.94 and 784.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.72 : 1,805.94 = 784.56 : x
2. Step 2: Convert to fraction form
   1,308.72/1,805.94 = 784.56/x
3. Step 3: Cross multiply
   1,308.72x = 1,805.94 × 784.56
4. Step 4: Simplify right side
   1,308.72x = 1,416,868.29
5. Step 5: Solve for x
   x = 1,416,868.29/1,308.72
6. Step 6: Final answer
   x = 1,082.64