Finding the Third Proportional to 39,657.50 and 52,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,657.50 : 52,870.50 = 52,870.50 : x
2. Step 2: Convert to fraction form
   39,657.50/52,870.50 = 52,870.50/x
3. Step 3: Cross multiply
   39,657.50x = 52,870.50 × 52,870.50
4. Step 4: Simplify right side
   39,657.50x = 2,795,289,770.25
5. Step 5: Solve for x
   x = 2,795,289,770.25/39,657.50
6. Step 6: Final answer
   x = 70,485.78