Finding the Fourth Proportional to 39,858.39, 55,003.89 and 21,955.05

Step by Step Solution

1. Step 1: Write the proportion equation
   39,858.39 : 55,003.89 = 21,955.05 : x
2. Step 2: Convert to fraction form
   39,858.39/55,003.89 = 21,955.05/x
3. Step 3: Cross multiply
   39,858.39x = 55,003.89 × 21,955.05
4. Step 4: Simplify right side
   39,858.39x = 1,207,613,155.14
5. Step 5: Solve for x
   x = 1,207,613,155.14/39,858.39
6. Step 6: Final answer
   x = 30,297.59