Finding the Fourth Proportional to 2,488.90, 3,432.90 and 1,605

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.90 : 3,432.90 = 1,605 : x
2. Step 2: Convert to fraction form
   2,488.90/3,432.90 = 1,605/x
3. Step 3: Cross multiply
   2,488.90x = 3,432.90 × 1,605
4. Step 4: Simplify right side
   2,488.90x = 5,509,804.50
5. Step 5: Solve for x
   x = 5,509,804.50/2,488.90
6. Step 6: Final answer
   x = 2,213.75