Finding the Third Proportional to 753,920 and 1,638,688

Step by Step Solution

1. Step 1: Write the proportion equation
   753,920 : 1,638,688 = 1,638,688 : x
2. Step 2: Convert to fraction form
   753,920/1,638,688 = 1,638,688/x
3. Step 3: Cross multiply
   753,920x = 1,638,688 × 1,638,688
4. Step 4: Simplify right side
   753,920x = 2,685,298,361,344
5. Step 5: Solve for x
   x = 2,685,298,361,344/753,920
6. Step 6: Final answer
   x = 3,561,781.57