Finding the Third Proportional to 7,780,638 and 12,501,297

Step by Step Solution

1. Step 1: Write the proportion equation
   7,780,638 : 12,501,297 = 12,501,297 : x
2. Step 2: Convert to fraction form
   7,780,638/12,501,297 = 12,501,297/x
3. Step 3: Cross multiply
   7,780,638x = 12,501,297 × 12,501,297
4. Step 4: Simplify right side
   7,780,638x = 156,282,426,682,209
5. Step 5: Solve for x
   x = 156,282,426,682,209/7,780,638
6. Step 6: Final answer
   x = 20,086,068.35