Finding the Third Proportional to 139,073 and 258,281

Step by Step Solution

1. Step 1: Write the proportion equation
   139,073 : 258,281 = 258,281 : x
2. Step 2: Convert to fraction form
   139,073/258,281 = 258,281/x
3. Step 3: Cross multiply
   139,073x = 258,281 × 258,281
4. Step 4: Simplify right side
   139,073x = 66,709,074,961
5. Step 5: Solve for x
   x = 66,709,074,961/139,073
6. Step 6: Final answer
   x = 479,669.49