Finding the Third Proportional to 40,280 and 86,389

Step by Step Solution

1. Step 1: Write the proportion equation
   40,280 : 86,389 = 86,389 : x
2. Step 2: Convert to fraction form
   40,280/86,389 = 86,389/x
3. Step 3: Cross multiply
   40,280x = 86,389 × 86,389
4. Step 4: Simplify right side
   40,280x = 7,463,059,321
5. Step 5: Solve for x
   x = 7,463,059,321/40,280
6. Step 6: Final answer
   x = 185,279.53