Finding the Third Proportional to 87,336 and 138,510

Step by Step Solution

1. Step 1: Write the proportion equation
   87,336 : 138,510 = 138,510 : x
2. Step 2: Convert to fraction form
   87,336/138,510 = 138,510/x
3. Step 3: Cross multiply
   87,336x = 138,510 × 138,510
4. Step 4: Simplify right side
   87,336x = 19,185,020,100
5. Step 5: Solve for x
   x = 19,185,020,100/87,336
6. Step 6: Final answer
   x = 219,669.10