Finding the Fourth Proportional to 2,690.56, 4,032.15 and 1,389.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,690.56 : 4,032.15 = 1,389.34 : x
2. Step 2: Convert to fraction form
   2,690.56/4,032.15 = 1,389.34/x
3. Step 3: Cross multiply
   2,690.56x = 4,032.15 × 1,389.34
4. Step 4: Simplify right side
   2,690.56x = 5,602,027.28
5. Step 5: Solve for x
   x = 5,602,027.28/2,690.56
6. Step 6: Final answer
   x = 2,082.10