Finding the Fourth Proportional to 12,854.72, 17,739.78 and 7,189.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,854.72 : 17,739.78 = 7,189.58 : x
2. Step 2: Convert to fraction form
   12,854.72/17,739.78 = 7,189.58/x
3. Step 3: Cross multiply
   12,854.72x = 17,739.78 × 7,189.58
4. Step 4: Simplify right side
   12,854.72x = 127,541,567.49
5. Step 5: Solve for x
   x = 127,541,567.49/12,854.72
6. Step 6: Final answer
   x = 9,921.77