Finding the Third Proportional to 155,143.50 and 248,914.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,143.50 : 248,914.50 = 248,914.50 : x
2. Step 2: Convert to fraction form
   155,143.50/248,914.50 = 248,914.50/x
3. Step 3: Cross multiply
   155,143.50x = 248,914.50 × 248,914.50
4. Step 4: Simplify right side
   155,143.50x = 61,958,428,310.25
5. Step 5: Solve for x
   x = 61,958,428,310.25/155,143.50
6. Step 6: Final answer
   x = 399,362.06