Finding the Fourth Proportional to 321,128.50, 443,157.34 and 193,804.10

Step by Step Solution

1. Step 1: Write the proportion equation
   321,128.50 : 443,157.34 = 193,804.10 : x
2. Step 2: Convert to fraction form
   321,128.50/443,157.34 = 193,804.10/x
3. Step 3: Cross multiply
   321,128.50x = 443,157.34 × 193,804.10
4. Step 4: Simplify right side
   321,128.50x = 85,885,709,437.09
5. Step 5: Solve for x
   x = 85,885,709,437.09/321,128.50
6. Step 6: Final answer
   x = 267,449.66