Finding the Fourth Proportional to 13,408.06, 18,500.34 and 7,742.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,408.06 : 18,500.34 = 7,742.72 : x
2. Step 2: Convert to fraction form
   13,408.06/18,500.34 = 7,742.72/x
3. Step 3: Cross multiply
   13,408.06x = 18,500.34 × 7,742.72
4. Step 4: Simplify right side
   13,408.06x = 143,242,952.52
5. Step 5: Solve for x
   x = 143,242,952.52/13,408.06
6. Step 6: Final answer
   x = 10,683.35