Finding the Fourth Proportional to 13,028.11, 17,978.72 and 7,059.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,028.11 : 17,978.72 = 7,059.78 : x
2. Step 2: Convert to fraction form
   13,028.11/17,978.72 = 7,059.78/x
3. Step 3: Cross multiply
   13,028.11x = 17,978.72 × 7,059.78
4. Step 4: Simplify right side
   13,028.11x = 126,925,799.06
5. Step 5: Solve for x
   x = 126,925,799.06/13,028.11
6. Step 6: Final answer
   x = 9,742.46