Finding the Fourth Proportional to 1,369.74, 1,889.71 and 872.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.74 : 1,889.71 = 872.29 : x
2. Step 2: Convert to fraction form
   1,369.74/1,889.71 = 872.29/x
3. Step 3: Cross multiply
   1,369.74x = 1,889.71 × 872.29
4. Step 4: Simplify right side
   1,369.74x = 1,648,375.14
5. Step 5: Solve for x
   x = 1,648,375.14/1,369.74
6. Step 6: Final answer
   x = 1,203.42