Finding the Fourth Proportional to 2,540.86, 3,810.56 and 980.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,540.86 : 3,810.56 = 980.76 : x
2. Step 2: Convert to fraction form
   2,540.86/3,810.56 = 980.76/x
3. Step 3: Cross multiply
   2,540.86x = 3,810.56 × 980.76
4. Step 4: Simplify right side
   2,540.86x = 3,737,244.83
5. Step 5: Solve for x
   x = 3,737,244.83/2,540.86
6. Step 6: Final answer
   x = 1,470.86