Finding the Fourth Proportional to 50.56, 69.77 and 31.15

Step by Step Solution

1. Step 1: Write the proportion equation
   50.56 : 69.77 = 31.15 : x
2. Step 2: Convert to fraction form
   50.56/69.77 = 31.15/x
3. Step 3: Cross multiply
   50.56x = 69.77 × 31.15
4. Step 4: Simplify right side
   50.56x = 2,173.34
5. Step 5: Solve for x
   x = 2,173.34/50.56
6. Step 6: Final answer
   x = 42.99