Finding the Fourth Proportional to 1,540.28, 2,125.25 and 980.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540.28 : 2,125.25 = 980.55 : x
2. Step 2: Convert to fraction form
   1,540.28/2,125.25 = 980.55/x
3. Step 3: Cross multiply
   1,540.28x = 2,125.25 × 980.55
4. Step 4: Simplify right side
   1,540.28x = 2,083,913.89
5. Step 5: Solve for x
   x = 2,083,913.89/1,540.28
6. Step 6: Final answer
   x = 1,352.94