Finding the Third Proportional to 9,290 and 19,840

Step by Step Solution

1. Step 1: Write the proportion equation
   9,290 : 19,840 = 19,840 : x
2. Step 2: Convert to fraction form
   9,290/19,840 = 19,840/x
3. Step 3: Cross multiply
   9,290x = 19,840 × 19,840
4. Step 4: Simplify right side
   9,290x = 393,625,600
5. Step 5: Solve for x
   x = 393,625,600/9,290
6. Step 6: Final answer
   x = 42,370.89