Finding the Fourth Proportional to 309,185.34, 463,174 and 213,105.48

Step by Step Solution

1. Step 1: Write the proportion equation
   309,185.34 : 463,174 = 213,105.48 : x
2. Step 2: Convert to fraction form
   309,185.34/463,174 = 213,105.48/x
3. Step 3: Cross multiply
   309,185.34x = 463,174 × 213,105.48
4. Step 4: Simplify right side
   309,185.34x = 98,704,917,593.52
5. Step 5: Solve for x
   x = 98,704,917,593.52/309,185.34
6. Step 6: Final answer
   x = 319,241.91