Finding the Third Proportional to 19,678.88 and 42,273.38

Step by Step Solution

1. Step 1: Write the proportion equation
   19,678.88 : 42,273.38 = 42,273.38 : x
2. Step 2: Convert to fraction form
   19,678.88/42,273.38 = 42,273.38/x
3. Step 3: Cross multiply
   19,678.88x = 42,273.38 × 42,273.38
4. Step 4: Simplify right side
   19,678.88x = 1,787,038,233.89
5. Step 5: Solve for x
   x = 1,787,038,233.89/19,678.88
6. Step 6: Final answer
   x = 90,809.98