Finding the Fourth Proportional to 31,858, 43,909.85 and 21,768.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,858 : 43,909.85 = 21,768.93 : x
2. Step 2: Convert to fraction form
   31,858/43,909.85 = 21,768.93/x
3. Step 3: Cross multiply
   31,858x = 43,909.85 × 21,768.93
4. Step 4: Simplify right side
   31,858x = 955,870,450.96
5. Step 5: Solve for x
   x = 955,870,450.96/31,858
6. Step 6: Final answer
   x = 30,004.09