Finding the Fourth Proportional to 2,612.20, 3,918.42 and 1,515.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.20 : 3,918.42 = 1,515.72 : x
2. Step 2: Convert to fraction form
   2,612.20/3,918.42 = 1,515.72/x
3. Step 3: Cross multiply
   2,612.20x = 3,918.42 × 1,515.72
4. Step 4: Simplify right side
   2,612.20x = 5,939,227.56
5. Step 5: Solve for x
   x = 5,939,227.56/2,612.20
6. Step 6: Final answer
   x = 2,273.65