Finding the Fourth Proportional to 321,488.64, 443,653.56 and 178,245

Step by Step Solution

1. Step 1: Write the proportion equation
   321,488.64 : 443,653.56 = 178,245 : x
2. Step 2: Convert to fraction form
   321,488.64/443,653.56 = 178,245/x
3. Step 3: Cross multiply
   321,488.64x = 443,653.56 × 178,245
4. Step 4: Simplify right side
   321,488.64x = 79,079,028,802.20
5. Step 5: Solve for x
   x = 79,079,028,802.20/321,488.64
6. Step 6: Final answer
   x = 245,977.68