Finding the Fourth Proportional to 20,569.47, 28,395.72 and 13,019.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,569.47 : 28,395.72 = 13,019.46 : x
2. Step 2: Convert to fraction form
   20,569.47/28,395.72 = 13,019.46/x
3. Step 3: Cross multiply
   20,569.47x = 28,395.72 × 13,019.46
4. Step 4: Simplify right side
   20,569.47x = 369,696,940.71
5. Step 5: Solve for x
   x = 369,696,940.71/20,569.47
6. Step 6: Final answer
   x = 17,973.09