Finding the Third Proportional to 316,078.50 and 698,631

Step by Step Solution

1. Step 1: Write the proportion equation
   316,078.50 : 698,631 = 698,631 : x
2. Step 2: Convert to fraction form
   316,078.50/698,631 = 698,631/x
3. Step 3: Cross multiply
   316,078.50x = 698,631 × 698,631
4. Step 4: Simplify right side
   316,078.50x = 488,085,274,161
5. Step 5: Solve for x
   x = 488,085,274,161/316,078.50
6. Step 6: Final answer
   x = 1,544,190.05