Finding the Third Proportional to 78,989.50 and 188,867.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,989.50 : 188,867.50 = 188,867.50 : x
2. Step 2: Convert to fraction form
   78,989.50/188,867.50 = 188,867.50/x
3. Step 3: Cross multiply
   78,989.50x = 188,867.50 × 188,867.50
4. Step 4: Simplify right side
   78,989.50x = 35,670,932,556.25
5. Step 5: Solve for x
   x = 35,670,932,556.25/78,989.50
6. Step 6: Final answer
   x = 451,590.81