Finding the Third Proportional to 2,572,420 and 5,587,688

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572,420 : 5,587,688 = 5,587,688 : x
2. Step 2: Convert to fraction form
   2,572,420/5,587,688 = 5,587,688/x
3. Step 3: Cross multiply
   2,572,420x = 5,587,688 × 5,587,688
4. Step 4: Simplify right side
   2,572,420x = 31,222,257,185,344
5. Step 5: Solve for x
   x = 31,222,257,185,344/2,572,420
6. Step 6: Final answer
   x = 12,137,309.30