Finding the Fourth Proportional to 2,010.78, 2,780.01 and 1,515.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,010.78 : 2,780.01 = 1,515.96 : x
2. Step 2: Convert to fraction form
   2,010.78/2,780.01 = 1,515.96/x
3. Step 3: Cross multiply
   2,010.78x = 2,780.01 × 1,515.96
4. Step 4: Simplify right side
   2,010.78x = 4,214,383.96
5. Step 5: Solve for x
   x = 4,214,383.96/2,010.78
6. Step 6: Final answer
   x = 2,095.90