Finding the Fourth Proportional to 3,971.73, 5,487.57 and 3,138.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,971.73 : 5,487.57 = 3,138.83 : x
2. Step 2: Convert to fraction form
   3,971.73/5,487.57 = 3,138.83/x
3. Step 3: Cross multiply
   3,971.73x = 5,487.57 × 3,138.83
4. Step 4: Simplify right side
   3,971.73x = 17,224,549.34
5. Step 5: Solve for x
   x = 17,224,549.34/3,971.73
6. Step 6: Final answer
   x = 4,336.79