Finding the Third Proportional to 64.87 and 100.91

Step by Step Solution

1. Step 1: Write the proportion equation
   64.87 : 100.91 = 100.91 : x
2. Step 2: Convert to fraction form
   64.87/100.91 = 100.91/x
3. Step 3: Cross multiply
   64.87x = 100.91 × 100.91
4. Step 4: Simplify right side
   64.87x = 10,183.60
5. Step 5: Solve for x
   x = 10,183.60/64.87
6. Step 6: Final answer
   x = 156.98