Finding the Third Proportional to 621,044.50 and 878,956.50

Step by Step Solution

1. Step 1: Write the proportion equation
   621,044.50 : 878,956.50 = 878,956.50 : x
2. Step 2: Convert to fraction form
   621,044.50/878,956.50 = 878,956.50/x
3. Step 3: Cross multiply
   621,044.50x = 878,956.50 × 878,956.50
4. Step 4: Simplify right side
   621,044.50x = 772,564,528,892.25
5. Step 5: Solve for x
   x = 772,564,528,892.25/621,044.50
6. Step 6: Final answer
   x = 1,243,976.12