Finding the Third Proportional to 159,780 and 248,431.50

Step by Step Solution

1. Step 1: Write the proportion equation
   159,780 : 248,431.50 = 248,431.50 : x
2. Step 2: Convert to fraction form
   159,780/248,431.50 = 248,431.50/x
3. Step 3: Cross multiply
   159,780x = 248,431.50 × 248,431.50
4. Step 4: Simplify right side
   159,780x = 61,718,210,192.25
5. Step 5: Solve for x
   x = 61,718,210,192.25/159,780
6. Step 6: Final answer
   x = 386,269.93