Finding the Fourth Proportional to 14,103.86, 21,155.38 and 5,221.31

Step by Step Solution

1. Step 1: Write the proportion equation
   14,103.86 : 21,155.38 = 5,221.31 : x
2. Step 2: Convert to fraction form
   14,103.86/21,155.38 = 5,221.31/x
3. Step 3: Cross multiply
   14,103.86x = 21,155.38 × 5,221.31
4. Step 4: Simplify right side
   14,103.86x = 110,458,678.32
5. Step 5: Solve for x
   x = 110,458,678.32/14,103.86
6. Step 6: Final answer
   x = 7,831.81