Finding the Fourth Proportional to 13,018.56, 17,965.94 and 7,985.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,018.56 : 17,965.94 = 7,985.56 : x
2. Step 2: Convert to fraction form
   13,018.56/17,965.94 = 7,985.56/x
3. Step 3: Cross multiply
   13,018.56x = 17,965.94 × 7,985.56
4. Step 4: Simplify right side
   13,018.56x = 143,468,082.78
5. Step 5: Solve for x
   x = 143,468,082.78/13,018.56
6. Step 6: Final answer
   x = 11,020.27