Finding the Third Proportional to 3,969,636 and 8,611,428

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969,636 : 8,611,428 = 8,611,428 : x
2. Step 2: Convert to fraction form
   3,969,636/8,611,428 = 8,611,428/x
3. Step 3: Cross multiply
   3,969,636x = 8,611,428 × 8,611,428
4. Step 4: Simplify right side
   3,969,636x = 74,156,692,199,184
5. Step 5: Solve for x
   x = 74,156,692,199,184/3,969,636
6. Step 6: Final answer
   x = 18,680,980.37