Finding the Fourth Proportional to 2,870.82, 3,960.90 and 1,691.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.82 : 3,960.90 = 1,691.46 : x
2. Step 2: Convert to fraction form
   2,870.82/3,960.90 = 1,691.46/x
3. Step 3: Cross multiply
   2,870.82x = 3,960.90 × 1,691.46
4. Step 4: Simplify right side
   2,870.82x = 6,699,703.91
5. Step 5: Solve for x
   x = 6,699,703.91/2,870.82
6. Step 6: Final answer
   x = 2,333.72