Finding the Fourth Proportional to 8,640.83, 12,960.79 and 2,796.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,640.83 : 12,960.79 = 2,796.98 : x
2. Step 2: Convert to fraction form
   8,640.83/12,960.79 = 2,796.98/x
3. Step 3: Cross multiply
   8,640.83x = 12,960.79 × 2,796.98
4. Step 4: Simplify right side
   8,640.83x = 36,251,095.82
5. Step 5: Solve for x
   x = 36,251,095.82/8,640.83
6. Step 6: Final answer
   x = 4,195.32