Finding the Third Proportional to 140,976 and 309,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   140,976 : 309,991.50 = 309,991.50 : x
2. Step 2: Convert to fraction form
   140,976/309,991.50 = 309,991.50/x
3. Step 3: Cross multiply
   140,976x = 309,991.50 × 309,991.50
4. Step 4: Simplify right side
   140,976x = 96,094,730,072.25
5. Step 5: Solve for x
   x = 96,094,730,072.25/140,976
6. Step 6: Final answer
   x = 681,638.93