Finding the Third Proportional to 147,639 and 221,422.50

Step by Step Solution

1. Step 1: Write the proportion equation
   147,639 : 221,422.50 = 221,422.50 : x
2. Step 2: Convert to fraction form
   147,639/221,422.50 = 221,422.50/x
3. Step 3: Cross multiply
   147,639x = 221,422.50 × 221,422.50
4. Step 4: Simplify right side
   147,639x = 49,027,923,506.25
5. Step 5: Solve for x
   x = 49,027,923,506.25/147,639
6. Step 6: Final answer
   x = 332,079.76