Finding the Third Proportional to 420,420 and 642,982.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,420 : 642,982.50 = 642,982.50 : x
2. Step 2: Convert to fraction form
   420,420/642,982.50 = 642,982.50/x
3. Step 3: Cross multiply
   420,420x = 642,982.50 × 642,982.50
4. Step 4: Simplify right side
   420,420x = 413,426,495,306.25
5. Step 5: Solve for x
   x = 413,426,495,306.25/420,420
6. Step 6: Final answer
   x = 983,365.43