Finding the Fourth Proportional to 117.59, 162.28 and 65.15

Step by Step Solution

1. Step 1: Write the proportion equation
   117.59 : 162.28 = 65.15 : x
2. Step 2: Convert to fraction form
   117.59/162.28 = 65.15/x
3. Step 3: Cross multiply
   117.59x = 162.28 × 65.15
4. Step 4: Simplify right side
   117.59x = 10,571.89
5. Step 5: Solve for x
   x = 10,571.89/117.59
6. Step 6: Final answer
   x = 89.91