Finding the Third Proportional to 139,924.50 and 306,091.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,924.50 : 306,091.50 = 306,091.50 : x
2. Step 2: Convert to fraction form
   139,924.50/306,091.50 = 306,091.50/x
3. Step 3: Cross multiply
   139,924.50x = 306,091.50 × 306,091.50
4. Step 4: Simplify right side
   139,924.50x = 93,692,006,372.25
5. Step 5: Solve for x
   x = 93,692,006,372.25/139,924.50
6. Step 6: Final answer
   x = 669,589.72