Finding the Third Proportional to 30,811.50 and 63,079.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,811.50 : 63,079.50 = 63,079.50 : x
2. Step 2: Convert to fraction form
   30,811.50/63,079.50 = 63,079.50/x
3. Step 3: Cross multiply
   30,811.50x = 63,079.50 × 63,079.50
4. Step 4: Simplify right side
   30,811.50x = 3,979,023,320.25
5. Step 5: Solve for x
   x = 3,979,023,320.25/30,811.50
6. Step 6: Final answer
   x = 129,140.85