Finding the Fourth Proportional to 2,515.90, 3,472.01 and 1,396.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.90 : 3,472.01 = 1,396.89 : x
2. Step 2: Convert to fraction form
   2,515.90/3,472.01 = 1,396.89/x
3. Step 3: Cross multiply
   2,515.90x = 3,472.01 × 1,396.89
4. Step 4: Simplify right side
   2,515.90x = 4,850,016.05
5. Step 5: Solve for x
   x = 4,850,016.05/2,515.90
6. Step 6: Final answer
   x = 1,927.75