Finding the Fourth Proportional to 12,739.86, 17,580.33 and 7,074.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739.86 : 17,580.33 = 7,074.54 : x
2. Step 2: Convert to fraction form
   12,739.86/17,580.33 = 7,074.54/x
3. Step 3: Cross multiply
   12,739.86x = 17,580.33 × 7,074.54
4. Step 4: Simplify right side
   12,739.86x = 124,372,747.80
5. Step 5: Solve for x
   x = 124,372,747.80/12,739.86
6. Step 6: Final answer
   x = 9,762.49