Finding the Third Proportional to 139,311 and 305,329.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,311 : 305,329.50 = 305,329.50 : x
2. Step 2: Convert to fraction form
   139,311/305,329.50 = 305,329.50/x
3. Step 3: Cross multiply
   139,311x = 305,329.50 × 305,329.50
4. Step 4: Simplify right side
   139,311x = 93,226,103,570.25
5. Step 5: Solve for x
   x = 93,226,103,570.25/139,311
6. Step 6: Final answer
   x = 669,194.13