Finding the Third Proportional to 105,990 and 153,270

Step by Step Solution

1. Step 1: Write the proportion equation
   105,990 : 153,270 = 153,270 : x
2. Step 2: Convert to fraction form
   105,990/153,270 = 153,270/x
3. Step 3: Cross multiply
   105,990x = 153,270 × 153,270
4. Step 4: Simplify right side
   105,990x = 23,491,692,900
5. Step 5: Solve for x
   x = 23,491,692,900/105,990
6. Step 6: Final answer
   x = 221,640.65