Finding the Fourth Proportional to 1,380.33, 1,904.58 and 791.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.33 : 1,904.58 = 791.06 : x
2. Step 2: Convert to fraction form
   1,380.33/1,904.58 = 791.06/x
3. Step 3: Cross multiply
   1,380.33x = 1,904.58 × 791.06
4. Step 4: Simplify right side
   1,380.33x = 1,506,627.53
5. Step 5: Solve for x
   x = 1,506,627.53/1,380.33
6. Step 6: Final answer
   x = 1,091.50