Finding the Fourth Proportional to 1,397.27, 1,929.14 and 866.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.27 : 1,929.14 = 866.72 : x
2. Step 2: Convert to fraction form
   1,397.27/1,929.14 = 866.72/x
3. Step 3: Cross multiply
   1,397.27x = 1,929.14 × 866.72
4. Step 4: Simplify right side
   1,397.27x = 1,672,019.89
5. Step 5: Solve for x
   x = 1,672,019.89/1,397.27
6. Step 6: Final answer
   x = 1,196.63