Finding the Fourth Proportional to 1,211.93, 1,672.61 and 714.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.93 : 1,672.61 = 714.56 : x
2. Step 2: Convert to fraction form
   1,211.93/1,672.61 = 714.56/x
3. Step 3: Cross multiply
   1,211.93x = 1,672.61 × 714.56
4. Step 4: Simplify right side
   1,211.93x = 1,195,186.17
5. Step 5: Solve for x
   x = 1,195,186.17/1,211.93
6. Step 6: Final answer
   x = 986.18