Finding the Third Proportional to 139,090.50 and 300,354.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,090.50 : 300,354.75 = 300,354.75 : x
2. Step 2: Convert to fraction form
   139,090.50/300,354.75 = 300,354.75/x
3. Step 3: Cross multiply
   139,090.50x = 300,354.75 × 300,354.75
4. Step 4: Simplify right side
   139,090.50x = 90,212,975,847.56
5. Step 5: Solve for x
   x = 90,212,975,847.56/139,090.50
6. Step 6: Final answer
   x = 648,591.93