Finding the Fourth Proportional to 21,012.56, 28,998.63 and 11,581.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.56 : 28,998.63 = 11,581.10 : x
2. Step 2: Convert to fraction form
   21,012.56/28,998.63 = 11,581.10/x
3. Step 3: Cross multiply
   21,012.56x = 28,998.63 × 11,581.10
4. Step 4: Simplify right side
   21,012.56x = 335,836,033.89
5. Step 5: Solve for x
   x = 335,836,033.89/21,012.56
6. Step 6: Final answer
   x = 15,982.63