Finding the Third Proportional to 64.86 and 100.30

Step by Step Solution

1. Step 1: Write the proportion equation
   64.86 : 100.30 = 100.30 : x
2. Step 2: Convert to fraction form
   64.86/100.30 = 100.30/x
3. Step 3: Cross multiply
   64.86x = 100.30 × 100.30
4. Step 4: Simplify right side
   64.86x = 10,060.25
5. Step 5: Solve for x
   x = 10,060.25/64.86
6. Step 6: Final answer
   x = 155.10