Finding the Fourth Proportional to 1,380.96, 1,905.84 and 791.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.96 : 1,905.84 = 791.52 : x
2. Step 2: Convert to fraction form
   1,380.96/1,905.84 = 791.52/x
3. Step 3: Cross multiply
   1,380.96x = 1,905.84 × 791.52
4. Step 4: Simplify right side
   1,380.96x = 1,508,510.48
5. Step 5: Solve for x
   x = 1,508,510.48/1,380.96
6. Step 6: Final answer
   x = 1,092.36