Finding the Fourth Proportional to 21,016.39, 31,518.43 and 7,865.68

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.39 : 31,518.43 = 7,865.68 : x
2. Step 2: Convert to fraction form
   21,016.39/31,518.43 = 7,865.68/x
3. Step 3: Cross multiply
   21,016.39x = 31,518.43 × 7,865.68
4. Step 4: Simplify right side
   21,016.39x = 247,913,944.83
5. Step 5: Solve for x
   x = 247,913,944.83/21,016.39
6. Step 6: Final answer
   x = 11,796.22