Finding the Third Proportional to 150,018 and 316,890

Step by Step Solution

1. Step 1: Write the proportion equation
   150,018 : 316,890 = 316,890 : x
2. Step 2: Convert to fraction form
   150,018/316,890 = 316,890/x
3. Step 3: Cross multiply
   150,018x = 316,890 × 316,890
4. Step 4: Simplify right side
   150,018x = 100,419,272,100
5. Step 5: Solve for x
   x = 100,419,272,100/150,018
6. Step 6: Final answer
   x = 669,381.49