Finding the Fourth Proportional to 3,985.16, 5,498.90 and 2,216.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.16 : 5,498.90 = 2,216.76 : x
2. Step 2: Convert to fraction form
   3,985.16/5,498.90 = 2,216.76/x
3. Step 3: Cross multiply
   3,985.16x = 5,498.90 × 2,216.76
4. Step 4: Simplify right side
   3,985.16x = 12,189,741.56
5. Step 5: Solve for x
   x = 12,189,741.56/3,985.16
6. Step 6: Final answer
   x = 3,058.78