Finding the Third Proportional to 15,390 and 32,400

Step by Step Solution

1. Step 1: Write the proportion equation
   15,390 : 32,400 = 32,400 : x
2. Step 2: Convert to fraction form
   15,390/32,400 = 32,400/x
3. Step 3: Cross multiply
   15,390x = 32,400 × 32,400
4. Step 4: Simplify right side
   15,390x = 1,049,760,000
5. Step 5: Solve for x
   x = 1,049,760,000/15,390
6. Step 6: Final answer
   x = 68,210.53