Finding the Fourth Proportional to 3,985.51, 5,499.78 and 2,216.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.51 : 5,499.78 = 2,216.77 : x
2. Step 2: Convert to fraction form
   3,985.51/5,499.78 = 2,216.77/x
3. Step 3: Cross multiply
   3,985.51x = 5,499.78 × 2,216.77
4. Step 4: Simplify right side
   3,985.51x = 12,191,747.31
5. Step 5: Solve for x
   x = 12,191,747.31/3,985.51
6. Step 6: Final answer
   x = 3,059.02