Finding the Fourth Proportional to 21,071.75, 31,608.83 and 7,924.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,071.75 : 31,608.83 = 7,924.23 : x
2. Step 2: Convert to fraction form
   21,071.75/31,608.83 = 7,924.23/x
3. Step 3: Cross multiply
   21,071.75x = 31,608.83 × 7,924.23
4. Step 4: Simplify right side
   21,071.75x = 250,475,599.33
5. Step 5: Solve for x
   x = 250,475,599.33/21,071.75
6. Step 6: Final answer
   x = 11,886.80