Finding the Third Proportional to 9,120 and 13,479

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120 : 13,479 = 13,479 : x
2. Step 2: Convert to fraction form
   9,120/13,479 = 13,479/x
3. Step 3: Cross multiply
   9,120x = 13,479 × 13,479
4. Step 4: Simplify right side
   9,120x = 181,683,441
5. Step 5: Solve for x
   x = 181,683,441/9,120
6. Step 6: Final answer
   x = 19,921.43