Finding the Third Proportional to 86,418 and 187,308

Step by Step Solution

1. Step 1: Write the proportion equation
   86,418 : 187,308 = 187,308 : x
2. Step 2: Convert to fraction form
   86,418/187,308 = 187,308/x
3. Step 3: Cross multiply
   86,418x = 187,308 × 187,308
4. Step 4: Simplify right side
   86,418x = 35,084,286,864
5. Step 5: Solve for x
   x = 35,084,286,864/86,418
6. Step 6: Final answer
   x = 405,983.56