Finding the Third Proportional to 47.31 and 64.38

Step by Step Solution

1. Step 1: Write the proportion equation
   47.31 : 64.38 = 64.38 : x
2. Step 2: Convert to fraction form
   47.31/64.38 = 64.38/x
3. Step 3: Cross multiply
   47.31x = 64.38 × 64.38
4. Step 4: Simplify right side
   47.31x = 4,144.14
5. Step 5: Solve for x
   x = 4,144.14/47.31
6. Step 6: Final answer
   x = 87.59