Finding the Fourth Proportional to 13,186.42, 18,196.55 and 7,216.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,186.42 : 18,196.55 = 7,216.93 : x
2. Step 2: Convert to fraction form
   13,186.42/18,196.55 = 7,216.93/x
3. Step 3: Cross multiply
   13,186.42x = 18,196.55 × 7,216.93
4. Step 4: Simplify right side
   13,186.42x = 131,323,191.51
5. Step 5: Solve for x
   x = 131,323,191.51/13,186.42
6. Step 6: Final answer
   x = 9,958.98