Finding the Third Proportional to 19,812 and 42,642

Step by Step Solution

1. Step 1: Write the proportion equation
   19,812 : 42,642 = 42,642 : x
2. Step 2: Convert to fraction form
   19,812/42,642 = 42,642/x
3. Step 3: Cross multiply
   19,812x = 42,642 × 42,642
4. Step 4: Simplify right side
   19,812x = 1,818,340,164
5. Step 5: Solve for x
   x = 1,818,340,164/19,812
6. Step 6: Final answer
   x = 91,779.74