Finding the Fourth Proportional to 2,588.58, 3,880.44 and 1,288.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,588.58 : 3,880.44 = 1,288.62 : x
2. Step 2: Convert to fraction form
   2,588.58/3,880.44 = 1,288.62/x
3. Step 3: Cross multiply
   2,588.58x = 3,880.44 × 1,288.62
4. Step 4: Simplify right side
   2,588.58x = 5,000,412.59
5. Step 5: Solve for x
   x = 5,000,412.59/2,588.58
6. Step 6: Final answer
   x = 1,931.72