Finding the Third Proportional to 64,200 and 139,242

Step by Step Solution

1. Step 1: Write the proportion equation
   64,200 : 139,242 = 139,242 : x
2. Step 2: Convert to fraction form
   64,200/139,242 = 139,242/x
3. Step 3: Cross multiply
   64,200x = 139,242 × 139,242
4. Step 4: Simplify right side
   64,200x = 19,388,334,564
5. Step 5: Solve for x
   x = 19,388,334,564/64,200
6. Step 6: Final answer
   x = 301,998.98