Finding the Fourth Proportional to 20,929.56, 28,870.72 and 12,541.20

Step by Step Solution

1. Step 1: Write the proportion equation
   20,929.56 : 28,870.72 = 12,541.20 : x
2. Step 2: Convert to fraction form
   20,929.56/28,870.72 = 12,541.20/x
3. Step 3: Cross multiply
   20,929.56x = 28,870.72 × 12,541.20
4. Step 4: Simplify right side
   20,929.56x = 362,073,473.66
5. Step 5: Solve for x
   x = 362,073,473.66/20,929.56
6. Step 6: Final answer
   x = 17,299.62