Finding the Fourth Proportional to 443,196.91, 665,002.97 and 218,434.82

Step by Step Solution

1. Step 1: Write the proportion equation
   443,196.91 : 665,002.97 = 218,434.82 : x
2. Step 2: Convert to fraction form
   443,196.91/665,002.97 = 218,434.82/x
3. Step 3: Cross multiply
   443,196.91x = 665,002.97 × 218,434.82
4. Step 4: Simplify right side
   443,196.91x = 145,259,804,051.42
5. Step 5: Solve for x
   x = 145,259,804,051.42/443,196.91
6. Step 6: Final answer
   x = 327,754.55