Finding the Third Proportional to 3,988,314 and 8,698,428

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988,314 : 8,698,428 = 8,698,428 : x
2. Step 2: Convert to fraction form
   3,988,314/8,698,428 = 8,698,428/x
3. Step 3: Cross multiply
   3,988,314x = 8,698,428 × 8,698,428
4. Step 4: Simplify right side
   3,988,314x = 75,662,649,671,184
5. Step 5: Solve for x
   x = 75,662,649,671,184/3,988,314
6. Step 6: Final answer
   x = 18,971,086.45