Finding the Fourth Proportional to 12,963.76, 17,887.57 and 7,659.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,963.76 : 17,887.57 = 7,659.41 : x
2. Step 2: Convert to fraction form
   12,963.76/17,887.57 = 7,659.41/x
3. Step 3: Cross multiply
   12,963.76x = 17,887.57 × 7,659.41
4. Step 4: Simplify right side
   12,963.76x = 137,008,123.95
5. Step 5: Solve for x
   x = 137,008,123.95/12,963.76
6. Step 6: Final answer
   x = 10,568.55