Finding the Fourth Proportional to 12,693.78, 17,517.60 and 7,028.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,693.78 : 17,517.60 = 7,028.10 : x
2. Step 2: Convert to fraction form
   12,693.78/17,517.60 = 7,028.10/x
3. Step 3: Cross multiply
   12,693.78x = 17,517.60 × 7,028.10
4. Step 4: Simplify right side
   12,693.78x = 123,115,444.56
5. Step 5: Solve for x
   x = 123,115,444.56/12,693.78
6. Step 6: Final answer
   x = 9,698.88