Finding the Fourth Proportional to 109.69, 151.39 and 83.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109.69 : 151.39 = 83.50 : x
2. Step 2: Convert to fraction form
   109.69/151.39 = 83.50/x
3. Step 3: Cross multiply
   109.69x = 151.39 × 83.50
4. Step 4: Simplify right side
   109.69x = 12,640.32
5. Step 5: Solve for x
   x = 12,640.32/109.69
6. Step 6: Final answer
   x = 115.24