Finding the Fourth Proportional to 19,499.63, 29,231.75 and 10,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   19,499.63 : 29,231.75 = 10,128.69 : x
2. Step 2: Convert to fraction form
   19,499.63/29,231.75 = 10,128.69/x
3. Step 3: Cross multiply
   19,499.63x = 29,231.75 × 10,128.69
4. Step 4: Simplify right side
   19,499.63x = 296,079,359.23
5. Step 5: Solve for x
   x = 296,079,359.23/19,499.63
6. Step 6: Final answer
   x = 15,183.85