Finding the Fourth Proportional to 674,429.34, 1,012,142.49 and 319,443.90

Step by Step Solution

1. Step 1: Write the proportion equation
   674,429.34 : 1,012,142.49 = 319,443.90 : x
2. Step 2: Convert to fraction form
   674,429.34/1,012,142.49 = 319,443.90/x
3. Step 3: Cross multiply
   674,429.34x = 1,012,142.49 × 319,443.90
4. Step 4: Simplify right side
   674,429.34x = 323,322,744,361.31
5. Step 5: Solve for x
   x = 323,322,744,361.31/674,429.34
6. Step 6: Final answer
   x = 479,401.96