Finding the Fourth Proportional to 12,679.20, 17,498.16 and 7,089.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,679.20 : 17,498.16 = 7,089.12 : x
2. Step 2: Convert to fraction form
   12,679.20/17,498.16 = 7,089.12/x
3. Step 3: Cross multiply
   12,679.20x = 17,498.16 × 7,089.12
4. Step 4: Simplify right side
   12,679.20x = 124,046,556.02
5. Step 5: Solve for x
   x = 124,046,556.02/12,679.20
6. Step 6: Final answer
   x = 9,783.47