Finding the Third Proportional to 19,489.50 and 42,099.75

Step by Step Solution

1. Step 1: Write the proportion equation
   19,489.50 : 42,099.75 = 42,099.75 : x
2. Step 2: Convert to fraction form
   19,489.50/42,099.75 = 42,099.75/x
3. Step 3: Cross multiply
   19,489.50x = 42,099.75 × 42,099.75
4. Step 4: Simplify right side
   19,489.50x = 1,772,388,950.06
5. Step 5: Solve for x
   x = 1,772,388,950.06/19,489.50
6. Step 6: Final answer
   x = 90,940.71