Finding the Third Proportional to 40,280 and 86,390

Step by Step Solution

1. Step 1: Write the proportion equation
   40,280 : 86,390 = 86,390 : x
2. Step 2: Convert to fraction form
   40,280/86,390 = 86,390/x
3. Step 3: Cross multiply
   40,280x = 86,390 × 86,390
4. Step 4: Simplify right side
   40,280x = 7,463,232,100
5. Step 5: Solve for x
   x = 7,463,232,100/40,280
6. Step 6: Final answer
   x = 185,283.82