Finding the Fourth Proportional to 20,863.82, 28,796.80 and 16,317.55

Step by Step Solution

1. Step 1: Write the proportion equation
   20,863.82 : 28,796.80 = 16,317.55 : x
2. Step 2: Convert to fraction form
   20,863.82/28,796.80 = 16,317.55/x
3. Step 3: Cross multiply
   20,863.82x = 28,796.80 × 16,317.55
4. Step 4: Simplify right side
   20,863.82x = 469,893,079.86
5. Step 5: Solve for x
   x = 469,893,079.86/20,863.82
6. Step 6: Final answer
   x = 22,521.91