Finding the Fourth Proportional to 85.68, 118.24 and 50.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85.68 : 118.24 = 50.72 : x
2. Step 2: Convert to fraction form
   85.68/118.24 = 50.72/x
3. Step 3: Cross multiply
   85.68x = 118.24 × 50.72
4. Step 4: Simplify right side
   85.68x = 5,997.13
5. Step 5: Solve for x
   x = 5,997.13/85.68
6. Step 6: Final answer
   x = 69.99