Finding the Third Proportional to 308,880.50 and 676,810.50

Step by Step Solution

1. Step 1: Write the proportion equation
   308,880.50 : 676,810.50 = 676,810.50 : x
2. Step 2: Convert to fraction form
   308,880.50/676,810.50 = 676,810.50/x
3. Step 3: Cross multiply
   308,880.50x = 676,810.50 × 676,810.50
4. Step 4: Simplify right side
   308,880.50x = 458,072,452,910.25
5. Step 5: Solve for x
   x = 458,072,452,910.25/308,880.50
6. Step 6: Final answer
   x = 1,483,008.65