Finding the Fourth Proportional to 12,739.16, 17,580.90 and 7,074.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739.16 : 17,580.90 = 7,074.56 : x
2. Step 2: Convert to fraction form
   12,739.16/17,580.90 = 7,074.56/x
3. Step 3: Cross multiply
   12,739.16x = 17,580.90 × 7,074.56
4. Step 4: Simplify right side
   12,739.16x = 124,377,131.90
5. Step 5: Solve for x
   x = 124,377,131.90/12,739.16
6. Step 6: Final answer
   x = 9,763.37