Finding the Third Proportional to 69,215.50 and 148,028.50

Step by Step Solution

1. Step 1: Write the proportion equation
   69,215.50 : 148,028.50 = 148,028.50 : x
2. Step 2: Convert to fraction form
   69,215.50/148,028.50 = 148,028.50/x
3. Step 3: Cross multiply
   69,215.50x = 148,028.50 × 148,028.50
4. Step 4: Simplify right side
   69,215.50x = 21,912,436,812.25
5. Step 5: Solve for x
   x = 21,912,436,812.25/69,215.50
6. Step 6: Final answer
   x = 316,582.80