Finding the Fourth Proportional to 3,985.05, 5,977.56 and 1,211.73

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.05 : 5,977.56 = 1,211.73 : x
2. Step 2: Convert to fraction form
   3,985.05/5,977.56 = 1,211.73/x
3. Step 3: Cross multiply
   3,985.05x = 5,977.56 × 1,211.73
4. Step 4: Simplify right side
   3,985.05x = 7,243,188.78
5. Step 5: Solve for x
   x = 7,243,188.78/3,985.05
6. Step 6: Final answer
   x = 1,817.59