Finding the Fourth Proportional to 2,143.56, 3,211.17 and 1,216.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.56 : 3,211.17 = 1,216.30 : x
2. Step 2: Convert to fraction form
   2,143.56/3,211.17 = 1,216.30/x
3. Step 3: Cross multiply
   2,143.56x = 3,211.17 × 1,216.30
4. Step 4: Simplify right side
   2,143.56x = 3,905,746.07
5. Step 5: Solve for x
   x = 3,905,746.07/2,143.56
6. Step 6: Final answer
   x = 1,822.08