Finding the Fourth Proportional to 1,380.46, 1,905.04 and 791.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.46 : 1,905.04 = 791.03 : x
2. Step 2: Convert to fraction form
   1,380.46/1,905.04 = 791.03/x
3. Step 3: Cross multiply
   1,380.46x = 1,905.04 × 791.03
4. Step 4: Simplify right side
   1,380.46x = 1,506,930.31
5. Step 5: Solve for x
   x = 1,506,930.31/1,380.46
6. Step 6: Final answer
   x = 1,091.62