Finding the Fourth Proportional to 21,043.50, 31,557.01 and 7,888.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,043.50 : 31,557.01 = 7,888.69 : x
2. Step 2: Convert to fraction form
   21,043.50/31,557.01 = 7,888.69/x
3. Step 3: Cross multiply
   21,043.50x = 31,557.01 × 7,888.69
4. Step 4: Simplify right side
   21,043.50x = 248,943,469.22
5. Step 5: Solve for x
   x = 248,943,469.22/21,043.50
6. Step 6: Final answer
   x = 11,829.95