Finding the Third Proportional to 42.08 and 64.86

Step by Step Solution

1. Step 1: Write the proportion equation
   42.08 : 64.86 = 64.86 : x
2. Step 2: Convert to fraction form
   42.08/64.86 = 64.86/x
3. Step 3: Cross multiply
   42.08x = 64.86 × 64.86
4. Step 4: Simplify right side
   42.08x = 4,207.25
5. Step 5: Solve for x
   x = 4,207.25/42.08
6. Step 6: Final answer
   x = 99.98