Finding the Fourth Proportional to 12,947.94, 17,867.63 and 7,644.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.94 : 17,867.63 = 7,644.47 : x
2. Step 2: Convert to fraction form
   12,947.94/17,867.63 = 7,644.47/x
3. Step 3: Cross multiply
   12,947.94x = 17,867.63 × 7,644.47
4. Step 4: Simplify right side
   12,947.94x = 136,588,433.95
5. Step 5: Solve for x
   x = 136,588,433.95/12,947.94
6. Step 6: Final answer
   x = 10,549.05