Finding the Fourth Proportional to 2,387.72, 3,575.22 and 1,288.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.72 : 3,575.22 = 1,288.68 : x
2. Step 2: Convert to fraction form
   2,387.72/3,575.22 = 1,288.68/x
3. Step 3: Cross multiply
   2,387.72x = 3,575.22 × 1,288.68
4. Step 4: Simplify right side
   2,387.72x = 4,607,314.51
5. Step 5: Solve for x
   x = 4,607,314.51/2,387.72
6. Step 6: Final answer
   x = 1,929.59