Finding the Fourth Proportional to 8,640.15, 12,961.89 and 3,374.94

Step by Step Solution

1. Step 1: Write the proportion equation
   8,640.15 : 12,961.89 = 3,374.94 : x
2. Step 2: Convert to fraction form
   8,640.15/12,961.89 = 3,374.94/x
3. Step 3: Cross multiply
   8,640.15x = 12,961.89 × 3,374.94
4. Step 4: Simplify right side
   8,640.15x = 43,745,601.04
5. Step 5: Solve for x
   x = 43,745,601.04/8,640.15
6. Step 6: Final answer
   x = 5,063.06