Finding the Third Proportional to 42,086 and 64,685

Step by Step Solution

1. Step 1: Write the proportion equation
   42,086 : 64,685 = 64,685 : x
2. Step 2: Convert to fraction form
   42,086/64,685 = 64,685/x
3. Step 3: Cross multiply
   42,086x = 64,685 × 64,685
4. Step 4: Simplify right side
   42,086x = 4,184,149,225
5. Step 5: Solve for x
   x = 4,184,149,225/42,086
6. Step 6: Final answer
   x = 99,419.03