Finding the Fourth Proportional to 83.89, 115.73 and 50.69

Step by Step Solution

1. Step 1: Write the proportion equation
   83.89 : 115.73 = 50.69 : x
2. Step 2: Convert to fraction form
   83.89/115.73 = 50.69/x
3. Step 3: Cross multiply
   83.89x = 115.73 × 50.69
4. Step 4: Simplify right side
   83.89x = 5,865.71
5. Step 5: Solve for x
   x = 5,865.71/83.89
6. Step 6: Final answer
   x = 69.92