Finding the Fourth Proportional to 2,077.35, 3,115.69 and 690.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,077.35 : 3,115.69 = 690.70 : x
2. Step 2: Convert to fraction form
   2,077.35/3,115.69 = 690.70/x
3. Step 3: Cross multiply
   2,077.35x = 3,115.69 × 690.70
4. Step 4: Simplify right side
   2,077.35x = 2,152,007.08
5. Step 5: Solve for x
   x = 2,152,007.08/2,077.35
6. Step 6: Final answer
   x = 1,035.94