Finding the Fourth Proportional to 50.99, 70.31 and 42.89

Step by Step Solution

1. Step 1: Write the proportion equation
   50.99 : 70.31 = 42.89 : x
2. Step 2: Convert to fraction form
   50.99/70.31 = 42.89/x
3. Step 3: Cross multiply
   50.99x = 70.31 × 42.89
4. Step 4: Simplify right side
   50.99x = 3,015.35
5. Step 5: Solve for x
   x = 3,015.35/50.99
6. Step 6: Final answer
   x = 59.14