Finding the Fourth Proportional to 1,069.34, 1,475.58 and 789.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.34 : 1,475.58 = 789.74 : x
2. Step 2: Convert to fraction form
   1,069.34/1,475.58 = 789.74/x
3. Step 3: Cross multiply
   1,069.34x = 1,475.58 × 789.74
4. Step 4: Simplify right side
   1,069.34x = 1,165,324.55
5. Step 5: Solve for x
   x = 1,165,324.55/1,069.34
6. Step 6: Final answer
   x = 1,089.76