Finding the Third Proportional to 636,322 and 890,090

Step by Step Solution

1. Step 1: Write the proportion equation
   636,322 : 890,090 = 890,090 : x
2. Step 2: Convert to fraction form
   636,322/890,090 = 890,090/x
3. Step 3: Cross multiply
   636,322x = 890,090 × 890,090
4. Step 4: Simplify right side
   636,322x = 792,260,208,100
5. Step 5: Solve for x
   x = 792,260,208,100/636,322
6. Step 6: Final answer
   x = 1,245,061.79