Finding the Third Proportional to 42,354 and 64,419

Step by Step Solution

1. Step 1: Write the proportion equation
   42,354 : 64,419 = 64,419 : x
2. Step 2: Convert to fraction form
   42,354/64,419 = 64,419/x
3. Step 3: Cross multiply
   42,354x = 64,419 × 64,419
4. Step 4: Simplify right side
   42,354x = 4,149,807,561
5. Step 5: Solve for x
   x = 4,149,807,561/42,354
6. Step 6: Final answer
   x = 97,979.12