Finding the Fourth Proportional to 2,388.96, 3,580.38 and 1,290.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.96 : 3,580.38 = 1,290.60 : x
2. Step 2: Convert to fraction form
   2,388.96/3,580.38 = 1,290.60/x
3. Step 3: Cross multiply
   2,388.96x = 3,580.38 × 1,290.60
4. Step 4: Simplify right side
   2,388.96x = 4,620,838.43
5. Step 5: Solve for x
   x = 4,620,838.43/2,388.96
6. Step 6: Final answer
   x = 1,934.25