Finding the Third Proportional to 30,520 and 64,321

Step by Step Solution

1. Step 1: Write the proportion equation
   30,520 : 64,321 = 64,321 : x
2. Step 2: Convert to fraction form
   30,520/64,321 = 64,321/x
3. Step 3: Cross multiply
   30,520x = 64,321 × 64,321
4. Step 4: Simplify right side
   30,520x = 4,137,191,041
5. Step 5: Solve for x
   x = 4,137,191,041/30,520
6. Step 6: Final answer
   x = 135,556.72