Finding the Third Proportional to 50,639.50 and 78,607.50

Step by Step Solution

1. Step 1: Write the proportion equation
   50,639.50 : 78,607.50 = 78,607.50 : x
2. Step 2: Convert to fraction form
   50,639.50/78,607.50 = 78,607.50/x
3. Step 3: Cross multiply
   50,639.50x = 78,607.50 × 78,607.50
4. Step 4: Simplify right side
   50,639.50x = 6,179,139,056.25
5. Step 5: Solve for x
   x = 6,179,139,056.25/50,639.50
6. Step 6: Final answer
   x = 122,022.12