Finding the Fourth Proportional to 43,105.39, 64,667.39 and 13,121.97

Step by Step Solution

1. Step 1: Write the proportion equation
   43,105.39 : 64,667.39 = 13,121.97 : x
2. Step 2: Convert to fraction form
   43,105.39/64,667.39 = 13,121.97/x
3. Step 3: Cross multiply
   43,105.39x = 64,667.39 × 13,121.97
4. Step 4: Simplify right side
   43,105.39x = 848,563,518.75
5. Step 5: Solve for x
   x = 848,563,518.75/43,105.39
6. Step 6: Final answer
   x = 19,685.79