Finding the Fourth Proportional to 12,793.91, 17,656.89 and 7,129.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,793.91 : 17,656.89 = 7,129.58 : x
2. Step 2: Convert to fraction form
   12,793.91/17,656.89 = 7,129.58/x
3. Step 3: Cross multiply
   12,793.91x = 17,656.89 × 7,129.58
4. Step 4: Simplify right side
   12,793.91x = 125,886,121.52
5. Step 5: Solve for x
   x = 125,886,121.52/12,793.91
6. Step 6: Final answer
   x = 9,839.54