Finding the Fourth Proportional to 117.79, 162.55 and 65.33

Step by Step Solution

1. Step 1: Write the proportion equation
   117.79 : 162.55 = 65.33 : x
2. Step 2: Convert to fraction form
   117.79/162.55 = 65.33/x
3. Step 3: Cross multiply
   117.79x = 162.55 × 65.33
4. Step 4: Simplify right side
   117.79x = 10,618.42
5. Step 5: Solve for x
   x = 10,618.42/117.79
6. Step 6: Final answer
   x = 90.15