Finding the Fourth Proportional to 13,013.78, 17,959.01 and 7,045.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,013.78 : 17,959.01 = 7,045.49 : x
2. Step 2: Convert to fraction form
   13,013.78/17,959.01 = 7,045.49/x
3. Step 3: Cross multiply
   13,013.78x = 17,959.01 × 7,045.49
4. Step 4: Simplify right side
   13,013.78x = 126,530,035.03
5. Step 5: Solve for x
   x = 126,530,035.03/13,013.78
6. Step 6: Final answer
   x = 9,722.78