Finding the Third Proportional to 140,572 and 309,940

Step by Step Solution

1. Step 1: Write the proportion equation
   140,572 : 309,940 = 309,940 : x
2. Step 2: Convert to fraction form
   140,572/309,940 = 309,940/x
3. Step 3: Cross multiply
   140,572x = 309,940 × 309,940
4. Step 4: Simplify right side
   140,572x = 96,062,803,600
5. Step 5: Solve for x
   x = 96,062,803,600/140,572
6. Step 6: Final answer
   x = 683,370.82