Finding the Fourth Proportional to 8,947.96, 12,348.72 and 5,171.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,947.96 : 12,348.72 = 5,171.80 : x
2. Step 2: Convert to fraction form
   8,947.96/12,348.72 = 5,171.80/x
3. Step 3: Cross multiply
   8,947.96x = 12,348.72 × 5,171.80
4. Step 4: Simplify right side
   8,947.96x = 63,865,110.10
5. Step 5: Solve for x
   x = 63,865,110.10/8,947.96
6. Step 6: Final answer
   x = 7,137.39