Finding the Fourth Proportional to 2,551.57, 3,819.15 and 1,317.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.57 : 3,819.15 = 1,317.30 : x
2. Step 2: Convert to fraction form
   2,551.57/3,819.15 = 1,317.30/x
3. Step 3: Cross multiply
   2,551.57x = 3,819.15 × 1,317.30
4. Step 4: Simplify right side
   2,551.57x = 5,030,966.30
5. Step 5: Solve for x
   x = 5,030,966.30/2,551.57
6. Step 6: Final answer
   x = 1,971.71