Finding the Third Proportional to 140,140 and 299,960

Step by Step Solution

1. Step 1: Write the proportion equation
   140,140 : 299,960 = 299,960 : x
2. Step 2: Convert to fraction form
   140,140/299,960 = 299,960/x
3. Step 3: Cross multiply
   140,140x = 299,960 × 299,960
4. Step 4: Simplify right side
   140,140x = 89,976,001,600
5. Step 5: Solve for x
   x = 89,976,001,600/140,140
6. Step 6: Final answer
   x = 642,043.68