Finding the Third Proportional to 139,630.50 and 301,400.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,630.50 : 301,400.50 = 301,400.50 : x
2. Step 2: Convert to fraction form
   139,630.50/301,400.50 = 301,400.50/x
3. Step 3: Cross multiply
   139,630.50x = 301,400.50 × 301,400.50
4. Step 4: Simplify right side
   139,630.50x = 90,842,261,400.25
5. Step 5: Solve for x
   x = 90,842,261,400.25/139,630.50
6. Step 6: Final answer
   x = 650,590.39