Finding the Fourth Proportional to 1,069.33, 1,475.57 and 789.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.33 : 1,475.57 = 789.72 : x
2. Step 2: Convert to fraction form
   1,069.33/1,475.57 = 789.72/x
3. Step 3: Cross multiply
   1,069.33x = 1,475.57 × 789.72
4. Step 4: Simplify right side
   1,069.33x = 1,165,287.14
5. Step 5: Solve for x
   x = 1,165,287.14/1,069.33
6. Step 6: Final answer
   x = 1,089.74