Finding the Fourth Proportional to 1,344.65, 1,855.30 and 784.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,344.65 : 1,855.30 = 784.79 : x
2. Step 2: Convert to fraction form
   1,344.65/1,855.30 = 784.79/x
3. Step 3: Cross multiply
   1,344.65x = 1,855.30 × 784.79
4. Step 4: Simplify right side
   1,344.65x = 1,456,020.89
5. Step 5: Solve for x
   x = 1,456,020.89/1,344.65
6. Step 6: Final answer
   x = 1,082.83