Finding the Third Proportional to 139,091.25 and 300,356.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,091.25 : 300,356.25 = 300,356.25 : x
2. Step 2: Convert to fraction form
   139,091.25/300,356.25 = 300,356.25/x
3. Step 3: Cross multiply
   139,091.25x = 300,356.25 × 300,356.25
4. Step 4: Simplify right side
   139,091.25x = 90,213,876,914.06
5. Step 5: Solve for x
   x = 90,213,876,914.06/139,091.25
6. Step 6: Final answer
   x = 648,594.91