Finding the Third Proportional to 140,242.50 and 300,411

Step by Step Solution

1. Step 1: Write the proportion equation
   140,242.50 : 300,411 = 300,411 : x
2. Step 2: Convert to fraction form
   140,242.50/300,411 = 300,411/x
3. Step 3: Cross multiply
   140,242.50x = 300,411 × 300,411
4. Step 4: Simplify right side
   140,242.50x = 90,246,768,921
5. Step 5: Solve for x
   x = 90,246,768,921/140,242.50
6. Step 6: Final answer
   x = 643,505.14