Finding the Fourth Proportional to 1,085.28, 1,496.49 and 980.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.28 : 1,496.49 = 980.34 : x
2. Step 2: Convert to fraction form
   1,085.28/1,496.49 = 980.34/x
3. Step 3: Cross multiply
   1,085.28x = 1,496.49 × 980.34
4. Step 4: Simplify right side
   1,085.28x = 1,467,069.01
5. Step 5: Solve for x
   x = 1,467,069.01/1,085.28
6. Step 6: Final answer
   x = 1,351.79