Finding the Third Proportional to 50,857.50 and 78,682.50

Step by Step Solution

1. Step 1: Write the proportion equation
   50,857.50 : 78,682.50 = 78,682.50 : x
2. Step 2: Convert to fraction form
   50,857.50/78,682.50 = 78,682.50/x
3. Step 3: Cross multiply
   50,857.50x = 78,682.50 × 78,682.50
4. Step 4: Simplify right side
   50,857.50x = 6,190,935,806.25
5. Step 5: Solve for x
   x = 6,190,935,806.25/50,857.50
6. Step 6: Final answer
   x = 121,731.03