Finding the Fourth Proportional to 1,085.51, 1,497.61 and 980.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.51 : 1,497.61 = 980.75 : x
2. Step 2: Convert to fraction form
   1,085.51/1,497.61 = 980.75/x
3. Step 3: Cross multiply
   1,085.51x = 1,497.61 × 980.75
4. Step 4: Simplify right side
   1,085.51x = 1,468,781.01
5. Step 5: Solve for x
   x = 1,468,781.01/1,085.51
6. Step 6: Final answer
   x = 1,353.08