Finding the Third Proportional to 312,200.50 and 676,890

Step by Step Solution

1. Step 1: Write the proportion equation
   312,200.50 : 676,890 = 676,890 : x
2. Step 2: Convert to fraction form
   312,200.50/676,890 = 676,890/x
3. Step 3: Cross multiply
   312,200.50x = 676,890 × 676,890
4. Step 4: Simplify right side
   312,200.50x = 458,180,072,100
5. Step 5: Solve for x
   x = 458,180,072,100/312,200.50
6. Step 6: Final answer
   x = 1,467,582.76