Finding the Fourth Proportional to 1,381.42, 1,906.20 and 791.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.42 : 1,906.20 = 791.92 : x
2. Step 2: Convert to fraction form
   1,381.42/1,906.20 = 791.92/x
3. Step 3: Cross multiply
   1,381.42x = 1,906.20 × 791.92
4. Step 4: Simplify right side
   1,381.42x = 1,509,557.90
5. Step 5: Solve for x
   x = 1,509,557.90/1,381.42
6. Step 6: Final answer
   x = 1,092.76