Finding the Third Proportional to 98,780.50 and 213,356.50

Step by Step Solution

1. Step 1: Write the proportion equation
   98,780.50 : 213,356.50 = 213,356.50 : x
2. Step 2: Convert to fraction form
   98,780.50/213,356.50 = 213,356.50/x
3. Step 3: Cross multiply
   98,780.50x = 213,356.50 × 213,356.50
4. Step 4: Simplify right side
   98,780.50x = 45,520,996,092.25
5. Step 5: Solve for x
   x = 45,520,996,092.25/98,780.50
6. Step 6: Final answer
   x = 460,829.78