Finding the Third Proportional to 42,212.81 and 89,172.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,212.81 : 89,172.56 = 89,172.56 : x
2. Step 2: Convert to fraction form
   42,212.81/89,172.56 = 89,172.56/x
3. Step 3: Cross multiply
   42,212.81x = 89,172.56 × 89,172.56
4. Step 4: Simplify right side
   42,212.81x = 7,951,745,902.82
5. Step 5: Solve for x
   x = 7,951,745,902.82/42,212.81
6. Step 6: Final answer
   x = 188,372.81