Finding the Third Proportional to 173,485.75 and 258,789.50

Step by Step Solution

1. Step 1: Write the proportion equation
   173,485.75 : 258,789.50 = 258,789.50 : x
2. Step 2: Convert to fraction form
   173,485.75/258,789.50 = 258,789.50/x
3. Step 3: Cross multiply
   173,485.75x = 258,789.50 × 258,789.50
4. Step 4: Simplify right side
   173,485.75x = 66,972,005,310.25
5. Step 5: Solve for x
   x = 66,972,005,310.25/173,485.75
6. Step 6: Final answer
   x = 386,037.50