Finding the Fourth Proportional to 74.72, 103.12 and 50.12

Step by Step Solution

1. Step 1: Write the proportion equation
   74.72 : 103.12 = 50.12 : x
2. Step 2: Convert to fraction form
   74.72/103.12 = 50.12/x
3. Step 3: Cross multiply
   74.72x = 103.12 × 50.12
4. Step 4: Simplify right side
   74.72x = 5,168.37
5. Step 5: Solve for x
   x = 5,168.37/74.72
6. Step 6: Final answer
   x = 69.17