Finding the Fourth Proportional to 3,609.18, 4,980.35 and 2,015.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,609.18 : 4,980.35 = 2,015.71 : x
2. Step 2: Convert to fraction form
   3,609.18/4,980.35 = 2,015.71/x
3. Step 3: Cross multiply
   3,609.18x = 4,980.35 × 2,015.71
4. Step 4: Simplify right side
   3,609.18x = 10,038,933.89
5. Step 5: Solve for x
   x = 10,038,933.89/3,609.18
6. Step 6: Final answer
   x = 2,781.50