Finding the Third Proportional to 645,507 and 1,418,408

Step by Step Solution

1. Step 1: Write the proportion equation
   645,507 : 1,418,408 = 1,418,408 : x
2. Step 2: Convert to fraction form
   645,507/1,418,408 = 1,418,408/x
3. Step 3: Cross multiply
   645,507x = 1,418,408 × 1,418,408
4. Step 4: Simplify right side
   645,507x = 2,011,881,254,464
5. Step 5: Solve for x
   x = 2,011,881,254,464/645,507
6. Step 6: Final answer
   x = 3,116,745.84