Finding the Fourth Proportional to 31,640.96, 43,667.73 and 18,212.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,640.96 : 43,667.73 = 18,212.78 : x
2. Step 2: Convert to fraction form
   31,640.96/43,667.73 = 18,212.78/x
3. Step 3: Cross multiply
   31,640.96x = 43,667.73 × 18,212.78
4. Step 4: Simplify right side
   31,640.96x = 795,310,759.59
5. Step 5: Solve for x
   x = 795,310,759.59/31,640.96
6. Step 6: Final answer
   x = 25,135.48