Finding the Fourth Proportional to 21,981.96, 30,340.56 and 12,556.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,981.96 : 30,340.56 = 12,556.02 : x
2. Step 2: Convert to fraction form
   21,981.96/30,340.56 = 12,556.02/x
3. Step 3: Cross multiply
   21,981.96x = 30,340.56 × 12,556.02
4. Step 4: Simplify right side
   21,981.96x = 380,956,678.17
5. Step 5: Solve for x
   x = 380,956,678.17/21,981.96
6. Step 6: Final answer
   x = 17,330.42