Finding the Fourth Proportional to 12,784.72, 19,087.40 and 10,816.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,784.72 : 19,087.40 = 10,816.96 : x
2. Step 2: Convert to fraction form
   12,784.72/19,087.40 = 10,816.96/x
3. Step 3: Cross multiply
   12,784.72x = 19,087.40 × 10,816.96
4. Step 4: Simplify right side
   12,784.72x = 206,467,642.30
5. Step 5: Solve for x
   x = 206,467,642.30/12,784.72
6. Step 6: Final answer
   x = 16,149.56