Finding the Fourth Proportional to 16,692.72, 25,050.96 and 12,321.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,692.72 : 25,050.96 = 12,321.60 : x
2. Step 2: Convert to fraction form
   16,692.72/25,050.96 = 12,321.60/x
3. Step 3: Cross multiply
   16,692.72x = 25,050.96 × 12,321.60
4. Step 4: Simplify right side
   16,692.72x = 308,667,908.74
5. Step 5: Solve for x
   x = 308,667,908.74/16,692.72
6. Step 6: Final answer
   x = 18,491.17