Finding the Fourth Proportional to 2,384.43, 3,290.51 and 1,390.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.43 : 3,290.51 = 1,390.38 : x
2. Step 2: Convert to fraction form
   2,384.43/3,290.51 = 1,390.38/x
3. Step 3: Cross multiply
   2,384.43x = 3,290.51 × 1,390.38
4. Step 4: Simplify right side
   2,384.43x = 4,575,052.34
5. Step 5: Solve for x
   x = 4,575,052.34/2,384.43
6. Step 6: Final answer
   x = 1,918.72