Finding the Fourth Proportional to 20,565, 30,781.28 and 13,550.84

Step by Step Solution

1. Step 1: Write the proportion equation
   20,565 : 30,781.28 = 13,550.84 : x
2. Step 2: Convert to fraction form
   20,565/30,781.28 = 13,550.84/x
3. Step 3: Cross multiply
   20,565x = 30,781.28 × 13,550.84
4. Step 4: Simplify right side
   20,565x = 417,112,200.28
5. Step 5: Solve for x
   x = 417,112,200.28/20,565
6. Step 6: Final answer
   x = 20,282.63