Finding the Third Proportional to 3,939,789 and 8,626,917

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939,789 : 8,626,917 = 8,626,917 : x
2. Step 2: Convert to fraction form
   3,939,789/8,626,917 = 8,626,917/x
3. Step 3: Cross multiply
   3,939,789x = 8,626,917 × 8,626,917
4. Step 4: Simplify right side
   3,939,789x = 74,423,696,924,889
5. Step 5: Solve for x
   x = 74,423,696,924,889/3,939,789
6. Step 6: Final answer
   x = 18,890,274.82