Finding the Fourth Proportional to 2,419.50, 3,338.91 and 1,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,419.50 : 3,338.91 = 1,315.50 : x
2. Step 2: Convert to fraction form
   2,419.50/3,338.91 = 1,315.50/x
3. Step 3: Cross multiply
   2,419.50x = 3,338.91 × 1,315.50
4. Step 4: Simplify right side
   2,419.50x = 4,392,336.11
5. Step 5: Solve for x
   x = 4,392,336.11/2,419.50
6. Step 6: Final answer
   x = 1,815.39