Finding the Fourth Proportional to 13,012.82, 17,945.39 and 8,540.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,012.82 : 17,945.39 = 8,540.45 : x
2. Step 2: Convert to fraction form
   13,012.82/17,945.39 = 8,540.45/x
3. Step 3: Cross multiply
   13,012.82x = 17,945.39 × 8,540.45
4. Step 4: Simplify right side
   13,012.82x = 153,261,637.65
5. Step 5: Solve for x
   x = 153,261,637.65/13,012.82
6. Step 6: Final answer
   x = 11,777.75