Finding the Third Proportional to 72,490 and 111,455

Step by Step Solution

1. Step 1: Write the proportion equation
   72,490 : 111,455 = 111,455 : x
2. Step 2: Convert to fraction form
   72,490/111,455 = 111,455/x
3. Step 3: Cross multiply
   72,490x = 111,455 × 111,455
4. Step 4: Simplify right side
   72,490x = 12,422,217,025
5. Step 5: Solve for x
   x = 12,422,217,025/72,490
6. Step 6: Final answer
   x = 171,364.56