Finding the Fourth Proportional to 151.69, 209.25 and 99.25

Step by Step Solution

1. Step 1: Write the proportion equation
   151.69 : 209.25 = 99.25 : x
2. Step 2: Convert to fraction form
   151.69/209.25 = 99.25/x
3. Step 3: Cross multiply
   151.69x = 209.25 × 99.25
4. Step 4: Simplify right side
   151.69x = 20,767.71
5. Step 5: Solve for x
   x = 20,767.71/151.69
6. Step 6: Final answer
   x = 136.91