Finding the Third Proportional to 9,418.50 and 19,890

Step by Step Solution

1. Step 1: Write the proportion equation
   9,418.50 : 19,890 = 19,890 : x
2. Step 2: Convert to fraction form
   9,418.50/19,890 = 19,890/x
3. Step 3: Cross multiply
   9,418.50x = 19,890 × 19,890
4. Step 4: Simplify right side
   9,418.50x = 395,612,100
5. Step 5: Solve for x
   x = 395,612,100/9,418.50
6. Step 6: Final answer
   x = 42,003.73