Finding the Fourth Proportional to 20,196.63, 30,294.51 and 5,405.55

Step by Step Solution

1. Step 1: Write the proportion equation
   20,196.63 : 30,294.51 = 5,405.55 : x
2. Step 2: Convert to fraction form
   20,196.63/30,294.51 = 5,405.55/x
3. Step 3: Cross multiply
   20,196.63x = 30,294.51 × 5,405.55
4. Step 4: Simplify right side
   20,196.63x = 163,758,488.53
5. Step 5: Solve for x
   x = 163,758,488.53/20,196.63
6. Step 6: Final answer
   x = 8,108.21