Finding the Fourth Proportional to 72.02, 107.87 and 50.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.02 : 107.87 = 50.31 : x
2. Step 2: Convert to fraction form
   72.02/107.87 = 50.31/x
3. Step 3: Cross multiply
   72.02x = 107.87 × 50.31
4. Step 4: Simplify right side
   72.02x = 5,426.69
5. Step 5: Solve for x
   x = 5,426.69/72.02
6. Step 6: Final answer
   x = 75.35