Finding the Fourth Proportional to 1,386.10, 1,912.78 and 796.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.10 : 1,912.78 = 796.63 : x
2. Step 2: Convert to fraction form
   1,386.10/1,912.78 = 796.63/x
3. Step 3: Cross multiply
   1,386.10x = 1,912.78 × 796.63
4. Step 4: Simplify right side
   1,386.10x = 1,523,764.38
5. Step 5: Solve for x
   x = 1,523,764.38/1,386.10
6. Step 6: Final answer
   x = 1,099.32