Finding the Third Proportional to 170,697 and 258,403.50

Step by Step Solution

1. Step 1: Write the proportion equation
   170,697 : 258,403.50 = 258,403.50 : x
2. Step 2: Convert to fraction form
   170,697/258,403.50 = 258,403.50/x
3. Step 3: Cross multiply
   170,697x = 258,403.50 × 258,403.50
4. Step 4: Simplify right side
   170,697x = 66,772,368,812.25
5. Step 5: Solve for x
   x = 66,772,368,812.25/170,697
6. Step 6: Final answer
   x = 391,174.82