Finding the Fourth Proportional to 2,310.42, 3,188.20 and 1,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,310.42 : 3,188.20 = 1,315.50 : x
2. Step 2: Convert to fraction form
   2,310.42/3,188.20 = 1,315.50/x
3. Step 3: Cross multiply
   2,310.42x = 3,188.20 × 1,315.50
4. Step 4: Simplify right side
   2,310.42x = 4,194,054.58
5. Step 5: Solve for x
   x = 4,194,054.58/2,310.42
6. Step 6: Final answer
   x = 1,815.28