Finding the Third Proportional to 7,777,872 and 12,173,400

Step by Step Solution

1. Step 1: Write the proportion equation
   7,777,872 : 12,173,400 = 12,173,400 : x
2. Step 2: Convert to fraction form
   7,777,872/12,173,400 = 12,173,400/x
3. Step 3: Cross multiply
   7,777,872x = 12,173,400 × 12,173,400
4. Step 4: Simplify right side
   7,777,872x = 148,191,667,560,000
5. Step 5: Solve for x
   x = 148,191,667,560,000/7,777,872
6. Step 6: Final answer
   x = 19,052,983.59