Finding the Third Proportional to 392,420 and 607,510

Step by Step Solution

1. Step 1: Write the proportion equation
   392,420 : 607,510 = 607,510 : x
2. Step 2: Convert to fraction form
   392,420/607,510 = 607,510/x
3. Step 3: Cross multiply
   392,420x = 607,510 × 607,510
4. Step 4: Simplify right side
   392,420x = 369,068,400,100
5. Step 5: Solve for x
   x = 369,068,400,100/392,420
6. Step 6: Final answer
   x = 940,493.35