Finding the Fourth Proportional to 8,641.11, 12,936.72 and 5,072.43

Step by Step Solution

1. Step 1: Write the proportion equation
   8,641.11 : 12,936.72 = 5,072.43 : x
2. Step 2: Convert to fraction form
   8,641.11/12,936.72 = 5,072.43/x
3. Step 3: Cross multiply
   8,641.11x = 12,936.72 × 5,072.43
4. Step 4: Simplify right side
   8,641.11x = 65,620,606.63
5. Step 5: Solve for x
   x = 65,620,606.63/8,641.11
6. Step 6: Final answer
   x = 7,594.00