Finding the Fourth Proportional to 8,900, 12,282.72 and 5,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,900 : 12,282.72 = 5,174.72 : x
2. Step 2: Convert to fraction form
   8,900/12,282.72 = 5,174.72/x
3. Step 3: Cross multiply
   8,900x = 12,282.72 × 5,174.72
4. Step 4: Simplify right side
   8,900x = 63,559,636.84
5. Step 5: Solve for x
   x = 63,559,636.84/8,900
6. Step 6: Final answer
   x = 7,141.53