Finding the Fourth Proportional to 2,076.90, 3,115.59 and 690.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.90 : 3,115.59 = 690.38 : x
2. Step 2: Convert to fraction form
   2,076.90/3,115.59 = 690.38/x
3. Step 3: Cross multiply
   2,076.90x = 3,115.59 × 690.38
4. Step 4: Simplify right side
   2,076.90x = 2,150,941.02
5. Step 5: Solve for x
   x = 2,150,941.02/2,076.90
6. Step 6: Final answer
   x = 1,035.65