Finding the Third Proportional to 143,002.50 and 209,721

Step by Step Solution

1. Step 1: Write the proportion equation
   143,002.50 : 209,721 = 209,721 : x
2. Step 2: Convert to fraction form
   143,002.50/209,721 = 209,721/x
3. Step 3: Cross multiply
   143,002.50x = 209,721 × 209,721
4. Step 4: Simplify right side
   143,002.50x = 43,982,897,841
5. Step 5: Solve for x
   x = 43,982,897,841/143,002.50
6. Step 6: Final answer
   x = 307,567.34