Finding the Fourth Proportional to 2,452.47, 3,384.59 and 1,390.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,452.47 : 3,384.59 = 1,390.23 : x
2. Step 2: Convert to fraction form
   2,452.47/3,384.59 = 1,390.23/x
3. Step 3: Cross multiply
   2,452.47x = 3,384.59 × 1,390.23
4. Step 4: Simplify right side
   2,452.47x = 4,705,351.60
5. Step 5: Solve for x
   x = 4,705,351.60/2,452.47
6. Step 6: Final answer
   x = 1,918.62