Finding the Fourth Proportional to 397,020.87, 595,196.52 and 172,212.06

Step by Step Solution

1. Step 1: Write the proportion equation
   397,020.87 : 595,196.52 = 172,212.06 : x
2. Step 2: Convert to fraction form
   397,020.87/595,196.52 = 172,212.06/x
3. Step 3: Cross multiply
   397,020.87x = 595,196.52 × 172,212.06
4. Step 4: Simplify right side
   397,020.87x = 102,500,018,814.03
5. Step 5: Solve for x
   x = 102,500,018,814.03/397,020.87
6. Step 6: Final answer
   x = 258,172.87