Finding the Fourth Proportional to 21,087.98, 31,621.55 and 7,043.19

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.98 : 31,621.55 = 7,043.19 : x
2. Step 2: Convert to fraction form
   21,087.98/31,621.55 = 7,043.19/x
3. Step 3: Cross multiply
   21,087.98x = 31,621.55 × 7,043.19
4. Step 4: Simplify right side
   21,087.98x = 222,716,584.74
5. Step 5: Solve for x
   x = 222,716,584.74/21,087.98
6. Step 6: Final answer
   x = 10,561.30