Finding the Third Proportional to 30,900 and 63,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,900 : 63,988.50 = 63,988.50 : x
2. Step 2: Convert to fraction form
   30,900/63,988.50 = 63,988.50/x
3. Step 3: Cross multiply
   30,900x = 63,988.50 × 63,988.50
4. Step 4: Simplify right side
   30,900x = 4,094,528,132.25
5. Step 5: Solve for x
   x = 4,094,528,132.25/30,900
6. Step 6: Final answer
   x = 132,509.00