Finding the Fourth Proportional to 1,385.78, 1,912.49 and 796.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.78 : 1,912.49 = 796.22 : x
2. Step 2: Convert to fraction form
   1,385.78/1,912.49 = 796.22/x
3. Step 3: Cross multiply
   1,385.78x = 1,912.49 × 796.22
4. Step 4: Simplify right side
   1,385.78x = 1,522,762.79
5. Step 5: Solve for x
   x = 1,522,762.79/1,385.78
6. Step 6: Final answer
   x = 1,098.85