Finding the Fourth Proportional to 20,436.17, 30,638.72 and 10,569.16

Step by Step Solution

1. Step 1: Write the proportion equation
   20,436.17 : 30,638.72 = 10,569.16 : x
2. Step 2: Convert to fraction form
   20,436.17/30,638.72 = 10,569.16/x
3. Step 3: Cross multiply
   20,436.17x = 30,638.72 × 10,569.16
4. Step 4: Simplify right side
   20,436.17x = 323,825,533.88
5. Step 5: Solve for x
   x = 323,825,533.88/20,436.17
6. Step 6: Final answer
   x = 15,845.71