Finding the Third Proportional to 139,081.50 and 300,336.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,081.50 : 300,336.75 = 300,336.75 : x
2. Step 2: Convert to fraction form
   139,081.50/300,336.75 = 300,336.75/x
3. Step 3: Cross multiply
   139,081.50x = 300,336.75 × 300,336.75
4. Step 4: Simplify right side
   139,081.50x = 90,202,163,400.56
5. Step 5: Solve for x
   x = 90,202,163,400.56/139,081.50
6. Step 6: Final answer
   x = 648,556.16