Finding the Fourth Proportional to 16,865.78, 25,298.71 and 5,178.98

Step by Step Solution

1. Step 1: Write the proportion equation
   16,865.78 : 25,298.71 = 5,178.98 : x
2. Step 2: Convert to fraction form
   16,865.78/25,298.71 = 5,178.98/x
3. Step 3: Cross multiply
   16,865.78x = 25,298.71 × 5,178.98
4. Step 4: Simplify right side
   16,865.78x = 131,021,513.12
5. Step 5: Solve for x
   x = 131,021,513.12/16,865.78
6. Step 6: Final answer
   x = 7,768.48