Finding the Fourth Proportional to 12,945.25, 19,413.75 and 4,178.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.25 : 19,413.75 = 4,178.12 : x
2. Step 2: Convert to fraction form
   12,945.25/19,413.75 = 4,178.12/x
3. Step 3: Cross multiply
   12,945.25x = 19,413.75 × 4,178.12
4. Step 4: Simplify right side
   12,945.25x = 81,112,977.15
5. Step 5: Solve for x
   x = 81,112,977.15/12,945.25
6. Step 6: Final answer
   x = 6,265.85