Finding the Fourth Proportional to 13,189.86, 18,202.22 and 7,221.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,189.86 : 18,202.22 = 7,221.42 : x
2. Step 2: Convert to fraction form
   13,189.86/18,202.22 = 7,221.42/x
3. Step 3: Cross multiply
   13,189.86x = 18,202.22 × 7,221.42
4. Step 4: Simplify right side
   13,189.86x = 131,445,875.55
5. Step 5: Solve for x
   x = 131,445,875.55/13,189.86
6. Step 6: Final answer
   x = 9,965.68