Finding the Third Proportional to 489,900 and 742,230.50

Step by Step Solution

1. Step 1: Write the proportion equation
   489,900 : 742,230.50 = 742,230.50 : x
2. Step 2: Convert to fraction form
   489,900/742,230.50 = 742,230.50/x
3. Step 3: Cross multiply
   489,900x = 742,230.50 × 742,230.50
4. Step 4: Simplify right side
   489,900x = 550,906,115,130.25
5. Step 5: Solve for x
   x = 550,906,115,130.25/489,900
6. Step 6: Final answer
   x = 1,124,527.69