Finding the Third Proportional to 19,561.88 and 42,161.25

Step by Step Solution

1. Step 1: Write the proportion equation
   19,561.88 : 42,161.25 = 42,161.25 : x
2. Step 2: Convert to fraction form
   19,561.88/42,161.25 = 42,161.25/x
3. Step 3: Cross multiply
   19,561.88x = 42,161.25 × 42,161.25
4. Step 4: Simplify right side
   19,561.88x = 1,777,571,001.56
5. Step 5: Solve for x
   x = 1,777,571,001.56/19,561.88
6. Step 6: Final answer
   x = 90,869.15