Finding the Fourth Proportional to 3,985.54, 5,499.69 and 2,216.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.54 : 5,499.69 = 2,216.77 : x
2. Step 2: Convert to fraction form
   3,985.54/5,499.69 = 2,216.77/x
3. Step 3: Cross multiply
   3,985.54x = 5,499.69 × 2,216.77
4. Step 4: Simplify right side
   3,985.54x = 12,191,547.80
5. Step 5: Solve for x
   x = 12,191,547.80/3,985.54
6. Step 6: Final answer
   x = 3,058.95