Finding the Fourth Proportional to 1,385.72, 1,912.20 and 796.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.72 : 1,912.20 = 796.28 : x
2. Step 2: Convert to fraction form
   1,385.72/1,912.20 = 796.28/x
3. Step 3: Cross multiply
   1,385.72x = 1,912.20 × 796.28
4. Step 4: Simplify right side
   1,385.72x = 1,522,646.62
5. Step 5: Solve for x
   x = 1,522,646.62/1,385.72
6. Step 6: Final answer
   x = 1,098.81