Finding the Fourth Proportional to 1,380.93, 2,069.34 and 1,089.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.93 : 2,069.34 = 1,089.12 : x
2. Step 2: Convert to fraction form
   1,380.93/2,069.34 = 1,089.12/x
3. Step 3: Cross multiply
   1,380.93x = 2,069.34 × 1,089.12
4. Step 4: Simplify right side
   1,380.93x = 2,253,759.58
5. Step 5: Solve for x
   x = 2,253,759.58/1,380.93
6. Step 6: Final answer
   x = 1,632.06