Finding the Fourth Proportional to 2,918.90, 4,389.15 and 2,443.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,918.90 : 4,389.15 = 2,443.70 : x
2. Step 2: Convert to fraction form
   2,918.90/4,389.15 = 2,443.70/x
3. Step 3: Cross multiply
   2,918.90x = 4,389.15 × 2,443.70
4. Step 4: Simplify right side
   2,918.90x = 10,725,765.86
5. Step 5: Solve for x
   x = 10,725,765.86/2,918.90
6. Step 6: Final answer
   x = 3,674.59