Finding the Fourth Proportional to 3,985.13, 5,499.36 and 2,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.13 : 5,499.36 = 2,216.72 : x
2. Step 2: Convert to fraction form
   3,985.13/5,499.36 = 2,216.72/x
3. Step 3: Cross multiply
   3,985.13x = 5,499.36 × 2,216.72
4. Step 4: Simplify right side
   3,985.13x = 12,190,541.30
5. Step 5: Solve for x
   x = 12,190,541.30/3,985.13
6. Step 6: Final answer
   x = 3,059.01