Finding the Fourth Proportional to 2,588.78, 3,877.50 and 1,287.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,588.78 : 3,877.50 = 1,287.92 : x
2. Step 2: Convert to fraction form
   2,588.78/3,877.50 = 1,287.92/x
3. Step 3: Cross multiply
   2,588.78x = 3,877.50 × 1,287.92
4. Step 4: Simplify right side
   2,588.78x = 4,993,909.80
5. Step 5: Solve for x
   x = 4,993,909.80/2,588.78
6. Step 6: Final answer
   x = 1,929.06