Finding the Fourth Proportional to 2,384.38, 3,290.34 and 1,389.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.38 : 3,290.34 = 1,389.70 : x
2. Step 2: Convert to fraction form
   2,384.38/3,290.34 = 1,389.70/x
3. Step 3: Cross multiply
   2,384.38x = 3,290.34 × 1,389.70
4. Step 4: Simplify right side
   2,384.38x = 4,572,577.27
5. Step 5: Solve for x
   x = 4,572,577.27/2,384.38
6. Step 6: Final answer
   x = 1,917.72