Finding the Third Proportional to 166,318 and 260,603.75

Step by Step Solution

1. Step 1: Write the proportion equation
   166,318 : 260,603.75 = 260,603.75 : x
2. Step 2: Convert to fraction form
   166,318/260,603.75 = 260,603.75/x
3. Step 3: Cross multiply
   166,318x = 260,603.75 × 260,603.75
4. Step 4: Simplify right side
   166,318x = 67,914,314,514.06
5. Step 5: Solve for x
   x = 67,914,314,514.06/166,318
6. Step 6: Final answer
   x = 408,340.13