Finding the Third Proportional to 216.42 and 336.02

Step by Step Solution

1. Step 1: Write the proportion equation
   216.42 : 336.02 = 336.02 : x
2. Step 2: Convert to fraction form
   216.42/336.02 = 336.02/x
3. Step 3: Cross multiply
   216.42x = 336.02 × 336.02
4. Step 4: Simplify right side
   216.42x = 112,911.75
5. Step 5: Solve for x
   x = 112,911.75/216.42
6. Step 6: Final answer
   x = 521.72