Finding the Fourth Proportional to 2,488.78, 3,725.13 and 1,317.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.78 : 3,725.13 = 1,317.12 : x
2. Step 2: Convert to fraction form
   2,488.78/3,725.13 = 1,317.12/x
3. Step 3: Cross multiply
   2,488.78x = 3,725.13 × 1,317.12
4. Step 4: Simplify right side
   2,488.78x = 4,906,443.23
5. Step 5: Solve for x
   x = 4,906,443.23/2,488.78
6. Step 6: Final answer
   x = 1,971.43