Finding the Third Proportional to 81,390 and 173,292

Step by Step Solution

1. Step 1: Write the proportion equation
   81,390 : 173,292 = 173,292 : x
2. Step 2: Convert to fraction form
   81,390/173,292 = 173,292/x
3. Step 3: Cross multiply
   81,390x = 173,292 × 173,292
4. Step 4: Simplify right side
   81,390x = 30,030,117,264
5. Step 5: Solve for x
   x = 30,030,117,264/81,390
6. Step 6: Final answer
   x = 368,965.69