Finding the Fourth Proportional to 5,415.20, 8,123.31 and 1,519.59

Step by Step Solution

1. Step 1: Write the proportion equation
   5,415.20 : 8,123.31 = 1,519.59 : x
2. Step 2: Convert to fraction form
   5,415.20/8,123.31 = 1,519.59/x
3. Step 3: Cross multiply
   5,415.20x = 8,123.31 × 1,519.59
4. Step 4: Simplify right side
   5,415.20x = 12,344,100.64
5. Step 5: Solve for x
   x = 12,344,100.64/5,415.20
6. Step 6: Final answer
   x = 2,279.53