Finding the Fourth Proportional to 12,786.72, 19,090.38 and 10,818.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.72 : 19,090.38 = 10,818.96 : x
2. Step 2: Convert to fraction form
   12,786.72/19,090.38 = 10,818.96/x
3. Step 3: Cross multiply
   12,786.72x = 19,090.38 × 10,818.96
4. Step 4: Simplify right side
   12,786.72x = 206,538,057.60
5. Step 5: Solve for x
   x = 206,538,057.60/12,786.72
6. Step 6: Final answer
   x = 16,152.54