Finding the Fourth Proportional to 5,388.57, 8,082.78 and 1,690.83

Step by Step Solution

1. Step 1: Write the proportion equation
   5,388.57 : 8,082.78 = 1,690.83 : x
2. Step 2: Convert to fraction form
   5,388.57/8,082.78 = 1,690.83/x
3. Step 3: Cross multiply
   5,388.57x = 8,082.78 × 1,690.83
4. Step 4: Simplify right side
   5,388.57x = 13,666,606.91
5. Step 5: Solve for x
   x = 13,666,606.91/5,388.57
6. Step 6: Final answer
   x = 2,536.22