Finding the Fourth Proportional to 13,067.02, 18,031.42 and 7,688.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,067.02 : 18,031.42 = 7,688.59 : x
2. Step 2: Convert to fraction form
   13,067.02/18,031.42 = 7,688.59/x
3. Step 3: Cross multiply
   13,067.02x = 18,031.42 × 7,688.59
4. Step 4: Simplify right side
   13,067.02x = 138,636,195.50
5. Step 5: Solve for x
   x = 138,636,195.50/13,067.02
6. Step 6: Final answer
   x = 10,609.63