Finding the Fourth Proportional to 12,799.58, 17,661.39 and 7,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,799.58 : 17,661.39 = 7,209.50 : x
2. Step 2: Convert to fraction form
   12,799.58/17,661.39 = 7,209.50/x
3. Step 3: Cross multiply
   12,799.58x = 17,661.39 × 7,209.50
4. Step 4: Simplify right side
   12,799.58x = 127,329,791.21
5. Step 5: Solve for x
   x = 127,329,791.21/12,799.58
6. Step 6: Final answer
   x = 9,947.97