Finding the Fourth Proportional to 309,139.92, 463,106.17 and 213,059.94

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139.92 : 463,106.17 = 213,059.94 : x
2. Step 2: Convert to fraction form
   309,139.92/463,106.17 = 213,059.94/x
3. Step 3: Cross multiply
   309,139.92x = 463,106.17 × 213,059.94
4. Step 4: Simplify right side
   309,139.92x = 98,669,371,728.53
5. Step 5: Solve for x
   x = 98,669,371,728.53/309,139.92
6. Step 6: Final answer
   x = 319,173.83