Finding the Fourth Proportional to 20,356.42, 28,091.37 and 11,404.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,356.42 : 28,091.37 = 11,404.30 : x
2. Step 2: Convert to fraction form
   20,356.42/28,091.37 = 11,404.30/x
3. Step 3: Cross multiply
   20,356.42x = 28,091.37 × 11,404.30
4. Step 4: Simplify right side
   20,356.42x = 320,362,410.89
5. Step 5: Solve for x
   x = 320,362,410.89/20,356.42
6. Step 6: Final answer
   x = 15,737.66