Finding the Fourth Proportional to 2,100.82, 3,151.55 and 694.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.82 : 3,151.55 = 694.80 : x
2. Step 2: Convert to fraction form
   2,100.82/3,151.55 = 694.80/x
3. Step 3: Cross multiply
   2,100.82x = 3,151.55 × 694.80
4. Step 4: Simplify right side
   2,100.82x = 2,189,696.94
5. Step 5: Solve for x
   x = 2,189,696.94/2,100.82
6. Step 6: Final answer
   x = 1,042.31