Finding the Third Proportional to 8,139,138 and 12,596,988

Step by Step Solution

1. Step 1: Write the proportion equation
   8,139,138 : 12,596,988 = 12,596,988 : x
2. Step 2: Convert to fraction form
   8,139,138/12,596,988 = 12,596,988/x
3. Step 3: Cross multiply
   8,139,138x = 12,596,988 × 12,596,988
4. Step 4: Simplify right side
   8,139,138x = 158,684,106,672,144
5. Step 5: Solve for x
   x = 158,684,106,672,144/8,139,138
6. Step 6: Final answer
   x = 19,496,426.61