Finding the Fourth Proportional to 28,809.82, 43,185.99 and 13,789.23

Step by Step Solution

1. Step 1: Write the proportion equation
   28,809.82 : 43,185.99 = 13,789.23 : x
2. Step 2: Convert to fraction form
   28,809.82/43,185.99 = 13,789.23/x
3. Step 3: Cross multiply
   28,809.82x = 43,185.99 × 13,789.23
4. Step 4: Simplify right side
   28,809.82x = 595,501,548.89
5. Step 5: Solve for x
   x = 595,501,548.89/28,809.82
6. Step 6: Final answer
   x = 20,670.09