Finding the Fourth Proportional to 21,336.37, 31,980.72 and 7,996.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,336.37 : 31,980.72 = 7,996.54 : x
2. Step 2: Convert to fraction form
   21,336.37/31,980.72 = 7,996.54/x
3. Step 3: Cross multiply
   21,336.37x = 31,980.72 × 7,996.54
4. Step 4: Simplify right side
   21,336.37x = 255,735,106.71
5. Step 5: Solve for x
   x = 255,735,106.71/21,336.37
6. Step 6: Final answer
   x = 11,985.88