Finding the Third Proportional to 128,358 and 170,347.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,358 : 170,347.50 = 170,347.50 : x
2. Step 2: Convert to fraction form
   128,358/170,347.50 = 170,347.50/x
3. Step 3: Cross multiply
   128,358x = 170,347.50 × 170,347.50
4. Step 4: Simplify right side
   128,358x = 29,018,270,756.25
5. Step 5: Solve for x
   x = 29,018,270,756.25/128,358
6. Step 6: Final answer
   x = 226,072.94