Finding the Fourth Proportional to 21,028.25, 31,547.43 and 7,880.73

Step by Step Solution

1. Step 1: Write the proportion equation
   21,028.25 : 31,547.43 = 7,880.73 : x
2. Step 2: Convert to fraction form
   21,028.25/31,547.43 = 7,880.73/x
3. Step 3: Cross multiply
   21,028.25x = 31,547.43 × 7,880.73
4. Step 4: Simplify right side
   21,028.25x = 248,616,778.02
5. Step 5: Solve for x
   x = 248,616,778.02/21,028.25
6. Step 6: Final answer
   x = 11,822.99