Finding the Third Proportional to 140,090 and 299,860

Step by Step Solution

1. Step 1: Write the proportion equation
   140,090 : 299,860 = 299,860 : x
2. Step 2: Convert to fraction form
   140,090/299,860 = 299,860/x
3. Step 3: Cross multiply
   140,090x = 299,860 × 299,860
4. Step 4: Simplify right side
   140,090x = 89,916,019,600
5. Step 5: Solve for x
   x = 89,916,019,600/140,090
6. Step 6: Final answer
   x = 641,844.67