Finding the Fourth Proportional to 323,436.18, 443,109.20 and 311,315.22

Step by Step Solution

1. Step 1: Write the proportion equation
   323,436.18 : 443,109.20 = 311,315.22 : x
2. Step 2: Convert to fraction form
   323,436.18/443,109.20 = 311,315.22/x
3. Step 3: Cross multiply
   323,436.18x = 443,109.20 × 311,315.22
4. Step 4: Simplify right side
   323,436.18x = 137,946,636,525.45
5. Step 5: Solve for x
   x = 137,946,636,525.45/323,436.18
6. Step 6: Final answer
   x = 426,503.42