Finding the Third Proportional to 619,320 and 872,144

Step by Step Solution

1. Step 1: Write the proportion equation
   619,320 : 872,144 = 872,144 : x
2. Step 2: Convert to fraction form
   619,320/872,144 = 872,144/x
3. Step 3: Cross multiply
   619,320x = 872,144 × 872,144
4. Step 4: Simplify right side
   619,320x = 760,635,156,736
5. Step 5: Solve for x
   x = 760,635,156,736/619,320
6. Step 6: Final answer
   x = 1,228,177.93