Finding the Fourth Proportional to 12,906.54, 19,359.90 and 5,115.33

Step by Step Solution

1. Step 1: Write the proportion equation
   12,906.54 : 19,359.90 = 5,115.33 : x
2. Step 2: Convert to fraction form
   12,906.54/19,359.90 = 5,115.33/x
3. Step 3: Cross multiply
   12,906.54x = 19,359.90 × 5,115.33
4. Step 4: Simplify right side
   12,906.54x = 99,032,277.27
5. Step 5: Solve for x
   x = 99,032,277.27/12,906.54
6. Step 6: Final answer
   x = 7,673.03