Finding the Fourth Proportional to 12,789.79, 19,098.38 and 10,454.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.79 : 19,098.38 = 10,454.36 : x
2. Step 2: Convert to fraction form
   12,789.79/19,098.38 = 10,454.36/x
3. Step 3: Cross multiply
   12,789.79x = 19,098.38 × 10,454.36
4. Step 4: Simplify right side
   12,789.79x = 199,661,211.78
5. Step 5: Solve for x
   x = 199,661,211.78/12,789.79
6. Step 6: Final answer
   x = 15,610.99