Finding the Fourth Proportional to 31,399.39, 43,298.56 and 21,850.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,399.39 : 43,298.56 = 21,850.09 : x
2. Step 2: Convert to fraction form
   31,399.39/43,298.56 = 21,850.09/x
3. Step 3: Cross multiply
   31,399.39x = 43,298.56 × 21,850.09
4. Step 4: Simplify right side
   31,399.39x = 946,077,432.87
5. Step 5: Solve for x
   x = 946,077,432.87/31,399.39
6. Step 6: Final answer
   x = 30,130.44