Finding the Fourth Proportional to 12,947.09, 17,867.52 and 7,641.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.09 : 17,867.52 = 7,641.90 : x
2. Step 2: Convert to fraction form
   12,947.09/17,867.52 = 7,641.90/x
3. Step 3: Cross multiply
   12,947.09x = 17,867.52 × 7,641.90
4. Step 4: Simplify right side
   12,947.09x = 136,541,801.09
5. Step 5: Solve for x
   x = 136,541,801.09/12,947.09
6. Step 6: Final answer
   x = 10,546.14