Finding the Fourth Proportional to 21,158.42, 31,738.04 and 7,115.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,158.42 : 31,738.04 = 7,115.86 : x
2. Step 2: Convert to fraction form
   21,158.42/31,738.04 = 7,115.86/x
3. Step 3: Cross multiply
   21,158.42x = 31,738.04 × 7,115.86
4. Step 4: Simplify right side
   21,158.42x = 225,843,449.31
5. Step 5: Solve for x
   x = 225,843,449.31/21,158.42
6. Step 6: Final answer
   x = 10,673.93