Finding the Fourth Proportional to 321,443.20, 443,501.76 and 187,281.28

Step by Step Solution

1. Step 1: Write the proportion equation
   321,443.20 : 443,501.76 = 187,281.28 : x
2. Step 2: Convert to fraction form
   321,443.20/443,501.76 = 187,281.28/x
3. Step 3: Cross multiply
   321,443.20x = 443,501.76 × 187,281.28
4. Step 4: Simplify right side
   321,443.20x = 83,059,577,295.05
5. Step 5: Solve for x
   x = 83,059,577,295.05/321,443.20
6. Step 6: Final answer
   x = 258,395.81