Finding the Third Proportional to 139,003.50 and 303,495.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,003.50 : 303,495.50 = 303,495.50 : x
2. Step 2: Convert to fraction form
   139,003.50/303,495.50 = 303,495.50/x
3. Step 3: Cross multiply
   139,003.50x = 303,495.50 × 303,495.50
4. Step 4: Simplify right side
   139,003.50x = 92,109,518,520.25
5. Step 5: Solve for x
   x = 92,109,518,520.25/139,003.50
6. Step 6: Final answer
   x = 662,641.72