Finding the Fourth Proportional to 20,268.58, 30,404.49 and 7,123.90

Step by Step Solution

1. Step 1: Write the proportion equation
   20,268.58 : 30,404.49 = 7,123.90 : x
2. Step 2: Convert to fraction form
   20,268.58/30,404.49 = 7,123.90/x
3. Step 3: Cross multiply
   20,268.58x = 30,404.49 × 7,123.90
4. Step 4: Simplify right side
   20,268.58x = 216,598,520.63
5. Step 5: Solve for x
   x = 216,598,520.63/20,268.58
6. Step 6: Final answer
   x = 10,686.42