Finding the Third Proportional to 420,888 and 631,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,888 : 631,819.50 = 631,819.50 : x
2. Step 2: Convert to fraction form
   420,888/631,819.50 = 631,819.50/x
3. Step 3: Cross multiply
   420,888x = 631,819.50 × 631,819.50
4. Step 4: Simplify right side
   420,888x = 399,195,880,580.25
5. Step 5: Solve for x
   x = 399,195,880,580.25/420,888
6. Step 6: Final answer
   x = 948,461.06