Finding the Third Proportional to 19,788 and 42,149

Step by Step Solution

1. Step 1: Write the proportion equation
   19,788 : 42,149 = 42,149 : x
2. Step 2: Convert to fraction form
   19,788/42,149 = 42,149/x
3. Step 3: Cross multiply
   19,788x = 42,149 × 42,149
4. Step 4: Simplify right side
   19,788x = 1,776,538,201
5. Step 5: Solve for x
   x = 1,776,538,201/19,788
6. Step 6: Final answer
   x = 89,778.56