Finding the Fourth Proportional to 151.89, 209.61 and 89.79

Step by Step Solution

1. Step 1: Write the proportion equation
   151.89 : 209.61 = 89.79 : x
2. Step 2: Convert to fraction form
   151.89/209.61 = 89.79/x
3. Step 3: Cross multiply
   151.89x = 209.61 × 89.79
4. Step 4: Simplify right side
   151.89x = 18,820.88
5. Step 5: Solve for x
   x = 18,820.88/151.89
6. Step 6: Final answer
   x = 123.91