Finding the Fourth Proportional to 1,308.29, 1,805.60 and 784.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.29 : 1,805.60 = 784.31 : x
2. Step 2: Convert to fraction form
   1,308.29/1,805.60 = 784.31/x
3. Step 3: Cross multiply
   1,308.29x = 1,805.60 × 784.31
4. Step 4: Simplify right side
   1,308.29x = 1,416,150.14
5. Step 5: Solve for x
   x = 1,416,150.14/1,308.29
6. Step 6: Final answer
   x = 1,082.44