Finding the Fourth Proportional to 1,697.96, 2,542.69 and 1,390.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,697.96 : 2,542.69 = 1,390.57 : x
2. Step 2: Convert to fraction form
   1,697.96/2,542.69 = 1,390.57/x
3. Step 3: Cross multiply
   1,697.96x = 2,542.69 × 1,390.57
4. Step 4: Simplify right side
   1,697.96x = 3,535,783.81
5. Step 5: Solve for x
   x = 3,535,783.81/1,697.96
6. Step 6: Final answer
   x = 2,082.37