Finding the Fourth Proportional to 229,806.72, 317,096.64 and 139,147.20

Step by Step Solution

1. Step 1: Write the proportion equation
   229,806.72 : 317,096.64 = 139,147.20 : x
2. Step 2: Convert to fraction form
   229,806.72/317,096.64 = 139,147.20/x
3. Step 3: Cross multiply
   229,806.72x = 317,096.64 × 139,147.20
4. Step 4: Simplify right side
   229,806.72x = 44,123,109,585.41
5. Step 5: Solve for x
   x = 44,123,109,585.41/229,806.72
6. Step 6: Final answer
   x = 192,000.95