Finding the Fourth Proportional to 1,243.69, 1,713.31 and 869.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,243.69 : 1,713.31 = 869.96 : x
2. Step 2: Convert to fraction form
   1,243.69/1,713.31 = 869.96/x
3. Step 3: Cross multiply
   1,243.69x = 1,713.31 × 869.96
4. Step 4: Simplify right side
   1,243.69x = 1,490,513.28
5. Step 5: Solve for x
   x = 1,490,513.28/1,243.69
6. Step 6: Final answer
   x = 1,198.46