Finding the Third Proportional to 139,437 and 213,340.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,437 : 213,340.50 = 213,340.50 : x
2. Step 2: Convert to fraction form
   139,437/213,340.50 = 213,340.50/x
3. Step 3: Cross multiply
   139,437x = 213,340.50 × 213,340.50
4. Step 4: Simplify right side
   139,437x = 45,514,168,940.25
5. Step 5: Solve for x
   x = 45,514,168,940.25/139,437
6. Step 6: Final answer
   x = 326,413.86