Finding the Fourth Proportional to 20,585.54, 28,397.61 and 13,019.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,585.54 : 28,397.61 = 13,019.12 : x
2. Step 2: Convert to fraction form
   20,585.54/28,397.61 = 13,019.12/x
3. Step 3: Cross multiply
   20,585.54x = 28,397.61 × 13,019.12
4. Step 4: Simplify right side
   20,585.54x = 369,711,892.30
5. Step 5: Solve for x
   x = 369,711,892.30/20,585.54
6. Step 6: Final answer
   x = 17,959.79