Finding the Third Proportional to 140,100.75 and 309,640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   140,100.75 : 309,640.50 = 309,640.50 : x
2. Step 2: Convert to fraction form
   140,100.75/309,640.50 = 309,640.50/x
3. Step 3: Cross multiply
   140,100.75x = 309,640.50 × 309,640.50
4. Step 4: Simplify right side
   140,100.75x = 95,877,239,240.25
5. Step 5: Solve for x
   x = 95,877,239,240.25/140,100.75
6. Step 6: Final answer
   x = 684,344.94