Finding the Third Proportional to 139,000.50 and 305,065

Step by Step Solution

1. Step 1: Write the proportion equation
   139,000.50 : 305,065 = 305,065 : x
2. Step 2: Convert to fraction form
   139,000.50/305,065 = 305,065/x
3. Step 3: Cross multiply
   139,000.50x = 305,065 × 305,065
4. Step 4: Simplify right side
   139,000.50x = 93,064,654,225
5. Step 5: Solve for x
   x = 93,064,654,225/139,000.50
6. Step 6: Final answer
   x = 669,527.48