Finding the Fourth Proportional to 323,378.98, 443,031.32 and 311,258.10

Step by Step Solution

1. Step 1: Write the proportion equation
   323,378.98 : 443,031.32 = 311,258.10 : x
2. Step 2: Convert to fraction form
   323,378.98/443,031.32 = 311,258.10/x
3. Step 3: Cross multiply
   323,378.98x = 443,031.32 × 311,258.10
4. Step 4: Simplify right side
   323,378.98x = 137,897,086,903.69
5. Step 5: Solve for x
   x = 137,897,086,903.69/323,378.98
6. Step 6: Final answer
   x = 426,425.64