Finding the Fourth Proportional to 1,969.31, 2,718.11 and 1,223.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,969.31 : 2,718.11 = 1,223.83 : x
2. Step 2: Convert to fraction form
   1,969.31/2,718.11 = 1,223.83/x
3. Step 3: Cross multiply
   1,969.31x = 2,718.11 × 1,223.83
4. Step 4: Simplify right side
   1,969.31x = 3,326,504.56
5. Step 5: Solve for x
   x = 3,326,504.56/1,969.31
6. Step 6: Final answer
   x = 1,689.17