Finding the Third Proportional to 12,439,991 and 25,873,123

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439,991 : 25,873,123 = 25,873,123 : x
2. Step 2: Convert to fraction form
   12,439,991/25,873,123 = 25,873,123/x
3. Step 3: Cross multiply
   12,439,991x = 25,873,123 × 25,873,123
4. Step 4: Simplify right side
   12,439,991x = 669,418,493,773,129
5. Step 5: Solve for x
   x = 669,418,493,773,129/12,439,991
6. Step 6: Final answer
   x = 53,811,814.96