Finding the Fourth Proportional to 151.59, 209.15 and 89.39

Step by Step Solution

1. Step 1: Write the proportion equation
   151.59 : 209.15 = 89.39 : x
2. Step 2: Convert to fraction form
   151.59/209.15 = 89.39/x
3. Step 3: Cross multiply
   151.59x = 209.15 × 89.39
4. Step 4: Simplify right side
   151.59x = 18,696.83
5. Step 5: Solve for x
   x = 18,696.83/151.59
6. Step 6: Final answer
   x = 123.34