Finding the Third Proportional to 30,603 and 64,878

Step by Step Solution

1. Step 1: Write the proportion equation
   30,603 : 64,878 = 64,878 : x
2. Step 2: Convert to fraction form
   30,603/64,878 = 64,878/x
3. Step 3: Cross multiply
   30,603x = 64,878 × 64,878
4. Step 4: Simplify right side
   30,603x = 4,209,154,884
5. Step 5: Solve for x
   x = 4,209,154,884/30,603
6. Step 6: Final answer
   x = 137,540.60