Finding the Fourth Proportional to 12,617.68, 17,412.72 and 7,028.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,617.68 : 17,412.72 = 7,028.80 : x
2. Step 2: Convert to fraction form
   12,617.68/17,412.72 = 7,028.80/x
3. Step 3: Cross multiply
   12,617.68x = 17,412.72 × 7,028.80
4. Step 4: Simplify right side
   12,617.68x = 122,390,526.34
5. Step 5: Solve for x
   x = 122,390,526.34/12,617.68
6. Step 6: Final answer
   x = 9,699.92