Finding the Fourth Proportional to 1,096.84, 1,644.45 and 980.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.84 : 1,644.45 = 980.20 : x
2. Step 2: Convert to fraction form
   1,096.84/1,644.45 = 980.20/x
3. Step 3: Cross multiply
   1,096.84x = 1,644.45 × 980.20
4. Step 4: Simplify right side
   1,096.84x = 1,611,889.89
5. Step 5: Solve for x
   x = 1,611,889.89/1,096.84
6. Step 6: Final answer
   x = 1,469.58