Finding the Third Proportional to 359,321 and 782,390

Step by Step Solution

1. Step 1: Write the proportion equation
   359,321 : 782,390 = 782,390 : x
2. Step 2: Convert to fraction form
   359,321/782,390 = 782,390/x
3. Step 3: Cross multiply
   359,321x = 782,390 × 782,390
4. Step 4: Simplify right side
   359,321x = 612,134,112,100
5. Step 5: Solve for x
   x = 612,134,112,100/359,321
6. Step 6: Final answer
   x = 1,703,585.69