Finding the Fourth Proportional to 12,799.78, 19,162.29 and 10,339.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,799.78 : 19,162.29 = 10,339.39 : x
2. Step 2: Convert to fraction form
   12,799.78/19,162.29 = 10,339.39/x
3. Step 3: Cross multiply
   12,799.78x = 19,162.29 × 10,339.39
4. Step 4: Simplify right side
   12,799.78x = 198,126,389.60
5. Step 5: Solve for x
   x = 198,126,389.60/12,799.78
6. Step 6: Final answer
   x = 15,478.89