Finding the Third Proportional to 3,988,312 and 8,698,424

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988,312 : 8,698,424 = 8,698,424 : x
2. Step 2: Convert to fraction form
   3,988,312/8,698,424 = 8,698,424/x
3. Step 3: Cross multiply
   3,988,312x = 8,698,424 × 8,698,424
4. Step 4: Simplify right side
   3,988,312x = 75,662,580,083,776
5. Step 5: Solve for x
   x = 75,662,580,083,776/3,988,312
6. Step 6: Final answer
   x = 18,971,078.51