Finding the Fourth Proportional to 1,211.77, 1,672.27 and 714.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.77 : 1,672.27 = 714.83 : x
2. Step 2: Convert to fraction form
   1,211.77/1,672.27 = 714.83/x
3. Step 3: Cross multiply
   1,211.77x = 1,672.27 × 714.83
4. Step 4: Simplify right side
   1,211.77x = 1,195,392.04
5. Step 5: Solve for x
   x = 1,195,392.04/1,211.77
6. Step 6: Final answer
   x = 986.49