Finding the Third Proportional to 138,208.50 and 301,430

Step by Step Solution

1. Step 1: Write the proportion equation
   138,208.50 : 301,430 = 301,430 : x
2. Step 2: Convert to fraction form
   138,208.50/301,430 = 301,430/x
3. Step 3: Cross multiply
   138,208.50x = 301,430 × 301,430
4. Step 4: Simplify right side
   138,208.50x = 90,860,044,900
5. Step 5: Solve for x
   x = 90,860,044,900/138,208.50
6. Step 6: Final answer
   x = 657,412.86