Finding the Third Proportional to 9,120 and 19,820

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120 : 19,820 = 19,820 : x
2. Step 2: Convert to fraction form
   9,120/19,820 = 19,820/x
3. Step 3: Cross multiply
   9,120x = 19,820 × 19,820
4. Step 4: Simplify right side
   9,120x = 392,832,400
5. Step 5: Solve for x
   x = 392,832,400/9,120
6. Step 6: Final answer
   x = 43,073.73