Finding the Third Proportional to 42,660 and 63,990

Step by Step Solution

1. Step 1: Write the proportion equation
   42,660 : 63,990 = 63,990 : x
2. Step 2: Convert to fraction form
   42,660/63,990 = 63,990/x
3. Step 3: Cross multiply
   42,660x = 63,990 × 63,990
4. Step 4: Simplify right side
   42,660x = 4,094,720,100
5. Step 5: Solve for x
   x = 4,094,720,100/42,660
6. Step 6: Final answer
   x = 95,985