Finding the Fourth Proportional to 12,641.71, 18,961.27 and 7,947.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,641.71 : 18,961.27 = 7,947.49 : x
2. Step 2: Convert to fraction form
   12,641.71/18,961.27 = 7,947.49/x
3. Step 3: Cross multiply
   12,641.71x = 18,961.27 × 7,947.49
4. Step 4: Simplify right side
   12,641.71x = 150,694,451.34
5. Step 5: Solve for x
   x = 150,694,451.34/12,641.71
6. Step 6: Final answer
   x = 11,920.41