Finding the Third Proportional to 19,740 and 42,408

Step by Step Solution

1. Step 1: Write the proportion equation
   19,740 : 42,408 = 42,408 : x
2. Step 2: Convert to fraction form
   19,740/42,408 = 42,408/x
3. Step 3: Cross multiply
   19,740x = 42,408 × 42,408
4. Step 4: Simplify right side
   19,740x = 1,798,438,464
5. Step 5: Solve for x
   x = 1,798,438,464/19,740
6. Step 6: Final answer
   x = 91,106.31