Finding the Fourth Proportional to 321,129.50, 443,158.72 and 193,805.10

Step by Step Solution

1. Step 1: Write the proportion equation
   321,129.50 : 443,158.72 = 193,805.10 : x
2. Step 2: Convert to fraction form
   321,129.50/443,158.72 = 193,805.10/x
3. Step 3: Cross multiply
   321,129.50x = 443,158.72 × 193,805.10
4. Step 4: Simplify right side
   321,129.50x = 85,886,420,045.47
5. Step 5: Solve for x
   x = 85,886,420,045.47/321,129.50
6. Step 6: Final answer
   x = 267,451.04