Finding the Fourth Proportional to 2,076.78, 3,115.23 and 690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.78 : 3,115.23 = 690.72 : x
2. Step 2: Convert to fraction form
   2,076.78/3,115.23 = 690.72/x
3. Step 3: Cross multiply
   2,076.78x = 3,115.23 × 690.72
4. Step 4: Simplify right side
   2,076.78x = 2,151,751.67
5. Step 5: Solve for x
   x = 2,151,751.67/2,076.78
6. Step 6: Final answer
   x = 1,036.10