Finding the Fourth Proportional to 1,100.96, 1,644.16 and 980

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.96 : 1,644.16 = 980 : x
2. Step 2: Convert to fraction form
   1,100.96/1,644.16 = 980/x
3. Step 3: Cross multiply
   1,100.96x = 1,644.16 × 980
4. Step 4: Simplify right side
   1,100.96x = 1,611,276.80
5. Step 5: Solve for x
   x = 1,611,276.80/1,100.96
6. Step 6: Final answer
   x = 1,463.52