Finding the Third Proportional to 3,988,280 and 8,698,360

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988,280 : 8,698,360 = 8,698,360 : x
2. Step 2: Convert to fraction form
   3,988,280/8,698,360 = 8,698,360/x
3. Step 3: Cross multiply
   3,988,280x = 8,698,360 × 8,698,360
4. Step 4: Simplify right side
   3,988,280x = 75,661,466,689,600
5. Step 5: Solve for x
   x = 75,661,466,689,600/3,988,280
6. Step 6: Final answer
   x = 18,970,951.56