Finding the Fourth Proportional to 3,985.72, 5,976.75 and 1,211.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.72 : 5,976.75 = 1,211.82 : x
2. Step 2: Convert to fraction form
   3,985.72/5,976.75 = 1,211.82/x
3. Step 3: Cross multiply
   3,985.72x = 5,976.75 × 1,211.82
4. Step 4: Simplify right side
   3,985.72x = 7,242,741.48
5. Step 5: Solve for x
   x = 7,242,741.48/3,985.72
6. Step 6: Final answer
   x = 1,817.17