Finding the Fourth Proportional to 79.69, 109.98 and 50.57

Step by Step Solution

1. Step 1: Write the proportion equation
   79.69 : 109.98 = 50.57 : x
2. Step 2: Convert to fraction form
   79.69/109.98 = 50.57/x
3. Step 3: Cross multiply
   79.69x = 109.98 × 50.57
4. Step 4: Simplify right side
   79.69x = 5,561.96
5. Step 5: Solve for x
   x = 5,561.96/79.69
6. Step 6: Final answer
   x = 69.80