Finding the Fourth Proportional to 86.02, 118.72 and 65.30

Step by Step Solution

1. Step 1: Write the proportion equation
   86.02 : 118.72 = 65.30 : x
2. Step 2: Convert to fraction form
   86.02/118.72 = 65.30/x
3. Step 3: Cross multiply
   86.02x = 118.72 × 65.30
4. Step 4: Simplify right side
   86.02x = 7,752.42
5. Step 5: Solve for x
   x = 7,752.42/86.02
6. Step 6: Final answer
   x = 90.12