Finding the Third Proportional to 621,666 and 912,100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   621,666 : 912,100.50 = 912,100.50 : x
2. Step 2: Convert to fraction form
   621,666/912,100.50 = 912,100.50/x
3. Step 3: Cross multiply
   621,666x = 912,100.50 × 912,100.50
4. Step 4: Simplify right side
   621,666x = 831,927,322,100.25
5. Step 5: Solve for x
   x = 831,927,322,100.25/621,666
6. Step 6: Final answer
   x = 1,338,222.33