Finding the Fourth Proportional to 21,818.96, 30,111.72 and 12,388.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.96 : 30,111.72 = 12,388.13 : x
2. Step 2: Convert to fraction form
   21,818.96/30,111.72 = 12,388.13/x
3. Step 3: Cross multiply
   21,818.96x = 30,111.72 × 12,388.13
4. Step 4: Simplify right side
   21,818.96x = 373,027,901.88
5. Step 5: Solve for x
   x = 373,027,901.88/21,818.96
6. Step 6: Final answer
   x = 17,096.50