Finding the Fourth Proportional to 3,985.91, 5,499.94 and 2,217.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.91 : 5,499.94 = 2,217.51 : x
2. Step 2: Convert to fraction form
   3,985.91/5,499.94 = 2,217.51/x
3. Step 3: Cross multiply
   3,985.91x = 5,499.94 × 2,217.51
4. Step 4: Simplify right side
   3,985.91x = 12,196,160.86
5. Step 5: Solve for x
   x = 12,196,160.86/3,985.91
6. Step 6: Final answer
   x = 3,059.82