Finding the Third Proportional to 489,321 and 715,099.50

Step by Step Solution

1. Step 1: Write the proportion equation
   489,321 : 715,099.50 = 715,099.50 : x
2. Step 2: Convert to fraction form
   489,321/715,099.50 = 715,099.50/x
3. Step 3: Cross multiply
   489,321x = 715,099.50 × 715,099.50
4. Step 4: Simplify right side
   489,321x = 511,367,294,900.25
5. Step 5: Solve for x
   x = 511,367,294,900.25/489,321
6. Step 6: Final answer
   x = 1,045,054.87