Finding the Fourth Proportional to 1,380.96, 1,904.41 and 1,065.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.96 : 1,904.41 = 1,065.73 : x
2. Step 2: Convert to fraction form
   1,380.96/1,904.41 = 1,065.73/x
3. Step 3: Cross multiply
   1,380.96x = 1,904.41 × 1,065.73
4. Step 4: Simplify right side
   1,380.96x = 2,029,584.77
5. Step 5: Solve for x
   x = 2,029,584.77/1,380.96
6. Step 6: Final answer
   x = 1,469.69