Finding the Fourth Proportional to 2,310.39, 3,188.61 and 1,315.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,310.39 : 3,188.61 = 1,315.87 : x
2. Step 2: Convert to fraction form
   2,310.39/3,188.61 = 1,315.87/x
3. Step 3: Cross multiply
   2,310.39x = 3,188.61 × 1,315.87
4. Step 4: Simplify right side
   2,310.39x = 4,195,788.27
5. Step 5: Solve for x
   x = 4,195,788.27/2,310.39
6. Step 6: Final answer
   x = 1,816.05