Finding the Fourth Proportional to 7,160.42, 9,881.94 and 3,974.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,160.42 : 9,881.94 = 3,974.72 : x
2. Step 2: Convert to fraction form
   7,160.42/9,881.94 = 3,974.72/x
3. Step 3: Cross multiply
   7,160.42x = 9,881.94 × 3,974.72
4. Step 4: Simplify right side
   7,160.42x = 39,277,944.56
5. Step 5: Solve for x
   x = 39,277,944.56/7,160.42
6. Step 6: Final answer
   x = 5,485.42