Finding the Third Proportional to 166,770 and 258,619.50

Step by Step Solution

1. Step 1: Write the proportion equation
   166,770 : 258,619.50 = 258,619.50 : x
2. Step 2: Convert to fraction form
   166,770/258,619.50 = 258,619.50/x
3. Step 3: Cross multiply
   166,770x = 258,619.50 × 258,619.50
4. Step 4: Simplify right side
   166,770x = 66,884,045,780.25
5. Step 5: Solve for x
   x = 66,884,045,780.25/166,770
6. Step 6: Final answer
   x = 401,055.62