Finding the Fourth Proportional to 70.56, 105.72 and 50.31

Step by Step Solution

1. Step 1: Write the proportion equation
   70.56 : 105.72 = 50.31 : x
2. Step 2: Convert to fraction form
   70.56/105.72 = 50.31/x
3. Step 3: Cross multiply
   70.56x = 105.72 × 50.31
4. Step 4: Simplify right side
   70.56x = 5,318.77
5. Step 5: Solve for x
   x = 5,318.77/70.56
6. Step 6: Final answer
   x = 75.38