Finding the Fourth Proportional to 1,211.69, 1,672.34 and 714.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.69 : 1,672.34 = 714.45 : x
2. Step 2: Convert to fraction form
   1,211.69/1,672.34 = 714.45/x
3. Step 3: Cross multiply
   1,211.69x = 1,672.34 × 714.45
4. Step 4: Simplify right side
   1,211.69x = 1,194,803.31
5. Step 5: Solve for x
   x = 1,194,803.31/1,211.69
6. Step 6: Final answer
   x = 986.06