Finding the Fourth Proportional to 2,310.57, 3,188.48 and 1,315.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,310.57 : 3,188.48 = 1,315.89 : x
2. Step 2: Convert to fraction form
   2,310.57/3,188.48 = 1,315.89/x
3. Step 3: Cross multiply
   2,310.57x = 3,188.48 × 1,315.89
4. Step 4: Simplify right side
   2,310.57x = 4,195,682.37
5. Step 5: Solve for x
   x = 4,195,682.37/2,310.57
6. Step 6: Final answer
   x = 1,815.86