Finding the Fourth Proportional to 16,778.88, 25,172.37 and 5,091.39

Step by Step Solution

1. Step 1: Write the proportion equation
   16,778.88 : 25,172.37 = 5,091.39 : x
2. Step 2: Convert to fraction form
   16,778.88/25,172.37 = 5,091.39/x
3. Step 3: Cross multiply
   16,778.88x = 25,172.37 × 5,091.39
4. Step 4: Simplify right side
   16,778.88x = 128,162,352.89
5. Step 5: Solve for x
   x = 128,162,352.89/16,778.88
6. Step 6: Final answer
   x = 7,638.31