Finding the Fourth Proportional to 1,172.43, 1,616.76 and 872.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.43 : 1,616.76 = 872.34 : x
2. Step 2: Convert to fraction form
   1,172.43/1,616.76 = 872.34/x
3. Step 3: Cross multiply
   1,172.43x = 1,616.76 × 872.34
4. Step 4: Simplify right side
   1,172.43x = 1,410,364.42
5. Step 5: Solve for x
   x = 1,410,364.42/1,172.43
6. Step 6: Final answer
   x = 1,202.94