Finding the Fourth Proportional to 21,084.12, 31,615.85 and 7,039.33

Step by Step Solution

1. Step 1: Write the proportion equation
   21,084.12 : 31,615.85 = 7,039.33 : x
2. Step 2: Convert to fraction form
   21,084.12/31,615.85 = 7,039.33/x
3. Step 3: Cross multiply
   21,084.12x = 31,615.85 × 7,039.33
4. Step 4: Simplify right side
   21,084.12x = 222,554,339.94
5. Step 5: Solve for x
   x = 222,554,339.94/21,084.12
6. Step 6: Final answer
   x = 10,555.54