Finding the Third Proportional to 85,422 and 128,092.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,422 : 128,092.50 = 128,092.50 : x
2. Step 2: Convert to fraction form
   85,422/128,092.50 = 128,092.50/x
3. Step 3: Cross multiply
   85,422x = 128,092.50 × 128,092.50
4. Step 4: Simplify right side
   85,422x = 16,407,688,556.25
5. Step 5: Solve for x
   x = 16,407,688,556.25/85,422
6. Step 6: Final answer
   x = 192,078.02