Finding the Fourth Proportional to 12,693.60, 17,516.72 and 7,028.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,693.60 : 17,516.72 = 7,028.28 : x
2. Step 2: Convert to fraction form
   12,693.60/17,516.72 = 7,028.28/x
3. Step 3: Cross multiply
   12,693.60x = 17,516.72 × 7,028.28
4. Step 4: Simplify right side
   12,693.60x = 123,112,412.84
5. Step 5: Solve for x
   x = 123,112,412.84/12,693.60
6. Step 6: Final answer
   x = 9,698.78