Finding the Fourth Proportional to 72.99, 109.46 and 69.57

Step by Step Solution

1. Step 1: Write the proportion equation
   72.99 : 109.46 = 69.57 : x
2. Step 2: Convert to fraction form
   72.99/109.46 = 69.57/x
3. Step 3: Cross multiply
   72.99x = 109.46 × 69.57
4. Step 4: Simplify right side
   72.99x = 7,614.78
5. Step 5: Solve for x
   x = 7,614.78/72.99
6. Step 6: Final answer
   x = 104.33