Finding the Third Proportional to 78,556.50 and 172,071

Step by Step Solution

1. Step 1: Write the proportion equation
   78,556.50 : 172,071 = 172,071 : x
2. Step 2: Convert to fraction form
   78,556.50/172,071 = 172,071/x
3. Step 3: Cross multiply
   78,556.50x = 172,071 × 172,071
4. Step 4: Simplify right side
   78,556.50x = 29,608,429,041
5. Step 5: Solve for x
   x = 29,608,429,041/78,556.50
6. Step 6: Final answer
   x = 376,906.16