Finding the Third Proportional to 155,115 and 248,869.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,115 : 248,869.50 = 248,869.50 : x
2. Step 2: Convert to fraction form
   155,115/248,869.50 = 248,869.50/x
3. Step 3: Cross multiply
   155,115x = 248,869.50 × 248,869.50
4. Step 4: Simplify right side
   155,115x = 61,936,028,030.25
5. Step 5: Solve for x
   x = 61,936,028,030.25/155,115
6. Step 6: Final answer
   x = 399,291.03