Finding the Third Proportional to 7,290 and 12,039

Step by Step Solution

1. Step 1: Write the proportion equation
   7,290 : 12,039 = 12,039 : x
2. Step 2: Convert to fraction form
   7,290/12,039 = 12,039/x
3. Step 3: Cross multiply
   7,290x = 12,039 × 12,039
4. Step 4: Simplify right side
   7,290x = 144,937,521
5. Step 5: Solve for x
   x = 144,937,521/7,290
6. Step 6: Final answer
   x = 19,881.69