Finding the Third Proportional to 170,307 and 257,827.50

Step by Step Solution

1. Step 1: Write the proportion equation
   170,307 : 257,827.50 = 257,827.50 : x
2. Step 2: Convert to fraction form
   170,307/257,827.50 = 257,827.50/x
3. Step 3: Cross multiply
   170,307x = 257,827.50 × 257,827.50
4. Step 4: Simplify right side
   170,307x = 66,475,019,756.25
5. Step 5: Solve for x
   x = 66,475,019,756.25/170,307
6. Step 6: Final answer
   x = 390,324.65