Finding the Fourth Proportional to 2,134.71, 3,203.28 and 1,211.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,134.71 : 3,203.28 = 1,211.31 : x
2. Step 2: Convert to fraction form
   2,134.71/3,203.28 = 1,211.31/x
3. Step 3: Cross multiply
   2,134.71x = 3,203.28 × 1,211.31
4. Step 4: Simplify right side
   2,134.71x = 3,880,165.10
5. Step 5: Solve for x
   x = 3,880,165.10/2,134.71
6. Step 6: Final answer
   x = 1,817.65