Finding the Fourth Proportional to 71.25, 106.83 and 50.91

Step by Step Solution

1. Step 1: Write the proportion equation
   71.25 : 106.83 = 50.91 : x
2. Step 2: Convert to fraction form
   71.25/106.83 = 50.91/x
3. Step 3: Cross multiply
   71.25x = 106.83 × 50.91
4. Step 4: Simplify right side
   71.25x = 5,438.72
5. Step 5: Solve for x
   x = 5,438.72/71.25
6. Step 6: Final answer
   x = 76.33