Finding the Fourth Proportional to 2,810.30, 3,878.89 and 1,690.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.30 : 3,878.89 = 1,690.67 : x
2. Step 2: Convert to fraction form
   2,810.30/3,878.89 = 1,690.67/x
3. Step 3: Cross multiply
   2,810.30x = 3,878.89 × 1,690.67
4. Step 4: Simplify right side
   2,810.30x = 6,557,928.43
5. Step 5: Solve for x
   x = 6,557,928.43/2,810.30
6. Step 6: Final answer
   x = 2,333.54