Finding the Third Proportional to 3,974,429 and 8,578,350

Step by Step Solution

1. Step 1: Write the proportion equation
   3,974,429 : 8,578,350 = 8,578,350 : x
2. Step 2: Convert to fraction form
   3,974,429/8,578,350 = 8,578,350/x
3. Step 3: Cross multiply
   3,974,429x = 8,578,350 × 8,578,350
4. Step 4: Simplify right side
   3,974,429x = 73,588,088,722,500
5. Step 5: Solve for x
   x = 73,588,088,722,500/3,974,429
6. Step 6: Final answer
   x = 18,515,386.42