Finding the Fourth Proportional to 443,743.82, 665,043.86 and 386,586.57

Step by Step Solution

1. Step 1: Write the proportion equation
   443,743.82 : 665,043.86 = 386,586.57 : x
2. Step 2: Convert to fraction form
   443,743.82/665,043.86 = 386,586.57/x
3. Step 3: Cross multiply
   443,743.82x = 665,043.86 × 386,586.57
4. Step 4: Simplify right side
   443,743.82x = 257,097,022,804.03
5. Step 5: Solve for x
   x = 257,097,022,804.03/443,743.82
6. Step 6: Final answer
   x = 579,381.65