Finding the Third Proportional to 147,390 and 315,810

Step by Step Solution

1. Step 1: Write the proportion equation
   147,390 : 315,810 = 315,810 : x
2. Step 2: Convert to fraction form
   147,390/315,810 = 315,810/x
3. Step 3: Cross multiply
   147,390x = 315,810 × 315,810
4. Step 4: Simplify right side
   147,390x = 99,735,956,100
5. Step 5: Solve for x
   x = 99,735,956,100/147,390
6. Step 6: Final answer
   x = 676,680.62