Finding the Fourth Proportional to 22,218.39, 30,663.42 and 12,788.76

Step by Step Solution

1. Step 1: Write the proportion equation
   22,218.39 : 30,663.42 = 12,788.76 : x
2. Step 2: Convert to fraction form
   22,218.39/30,663.42 = 12,788.76/x
3. Step 3: Cross multiply
   22,218.39x = 30,663.42 × 12,788.76
4. Step 4: Simplify right side
   22,218.39x = 392,147,119.16
5. Step 5: Solve for x
   x = 392,147,119.16/22,218.39
6. Step 6: Final answer
   x = 17,649.66