Finding the Fourth Proportional to 13,090.37, 18,067.73 and 7,788.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,090.37 : 18,067.73 = 7,788.21 : x
2. Step 2: Convert to fraction form
   13,090.37/18,067.73 = 7,788.21/x
3. Step 3: Cross multiply
   13,090.37x = 18,067.73 × 7,788.21
4. Step 4: Simplify right side
   13,090.37x = 140,715,168.77
5. Step 5: Solve for x
   x = 140,715,168.77/13,090.37
6. Step 6: Final answer
   x = 10,749.52