Finding the Third Proportional to 411,915.75 and 619,980

Step by Step Solution

1. Step 1: Write the proportion equation
   411,915.75 : 619,980 = 619,980 : x
2. Step 2: Convert to fraction form
   411,915.75/619,980 = 619,980/x
3. Step 3: Cross multiply
   411,915.75x = 619,980 × 619,980
4. Step 4: Simplify right side
   411,915.75x = 384,375,200,400
5. Step 5: Solve for x
   x = 384,375,200,400/411,915.75
6. Step 6: Final answer
   x = 933,140.33