Finding the Third Proportional to 17,400 and 19,200

Step by Step Solution

1. Step 1: Write the proportion equation
   17,400 : 19,200 = 19,200 : x
2. Step 2: Convert to fraction form
   17,400/19,200 = 19,200/x
3. Step 3: Cross multiply
   17,400x = 19,200 × 19,200
4. Step 4: Simplify right side
   17,400x = 368,640,000
5. Step 5: Solve for x
   x = 368,640,000/17,400
6. Step 6: Final answer
   x = 21,186.21