Finding the Fourth Proportional to 12,221.67, 18,330.15 and 5,200.35

Step by Step Solution

1. Step 1: Write the proportion equation
   12,221.67 : 18,330.15 = 5,200.35 : x
2. Step 2: Convert to fraction form
   12,221.67/18,330.15 = 5,200.35/x
3. Step 3: Cross multiply
   12,221.67x = 18,330.15 × 5,200.35
4. Step 4: Simplify right side
   12,221.67x = 95,323,195.55
5. Step 5: Solve for x
   x = 95,323,195.55/12,221.67
6. Step 6: Final answer
   x = 7,799.52