Finding the Fourth Proportional to 1,396.72, 1,926.48 and 872.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.72 : 1,926.48 = 872.56 : x
2. Step 2: Convert to fraction form
   1,396.72/1,926.48 = 872.56/x
3. Step 3: Cross multiply
   1,396.72x = 1,926.48 × 872.56
4. Step 4: Simplify right side
   1,396.72x = 1,680,969.39
5. Step 5: Solve for x
   x = 1,680,969.39/1,396.72
6. Step 6: Final answer
   x = 1,203.51