Finding the Fourth Proportional to 3,985.34, 5,977.81 and 1,211.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.34 : 5,977.81 = 1,211.96 : x
2. Step 2: Convert to fraction form
   3,985.34/5,977.81 = 1,211.96/x
3. Step 3: Cross multiply
   3,985.34x = 5,977.81 × 1,211.96
4. Step 4: Simplify right side
   3,985.34x = 7,244,833.69
5. Step 5: Solve for x
   x = 7,244,833.69/3,985.34
6. Step 6: Final answer
   x = 1,817.87