Finding the Fourth Proportional to 1,211.72, 1,672.10 and 714.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.72 : 1,672.10 = 714.27 : x
2. Step 2: Convert to fraction form
   1,211.72/1,672.10 = 714.27/x
3. Step 3: Cross multiply
   1,211.72x = 1,672.10 × 714.27
4. Step 4: Simplify right side
   1,211.72x = 1,194,318.94
5. Step 5: Solve for x
   x = 1,194,318.94/1,211.72
6. Step 6: Final answer
   x = 985.64