Finding the Third Proportional to 8,638,128 and 18,898,500

Step by Step Solution

1. Step 1: Write the proportion equation
   8,638,128 : 18,898,500 = 18,898,500 : x
2. Step 2: Convert to fraction form
   8,638,128/18,898,500 = 18,898,500/x
3. Step 3: Cross multiply
   8,638,128x = 18,898,500 × 18,898,500
4. Step 4: Simplify right side
   8,638,128x = 357,153,302,250,000
5. Step 5: Solve for x
   x = 357,153,302,250,000/8,638,128
6. Step 6: Final answer
   x = 41,346,146.09