Finding the Third Proportional to 3,908,221 and 8,484,890

Step by Step Solution

1. Step 1: Write the proportion equation
   3,908,221 : 8,484,890 = 8,484,890 : x
2. Step 2: Convert to fraction form
   3,908,221/8,484,890 = 8,484,890/x
3. Step 3: Cross multiply
   3,908,221x = 8,484,890 × 8,484,890
4. Step 4: Simplify right side
   3,908,221x = 71,993,358,312,100
5. Step 5: Solve for x
   x = 71,993,358,312,100/3,908,221
6. Step 6: Final answer
   x = 18,421,004.93