Finding the Fourth Proportional to 4,919.31, 7,377.30 and 2,145.15

Step by Step Solution

1. Step 1: Write the proportion equation
   4,919.31 : 7,377.30 = 2,145.15 : x
2. Step 2: Convert to fraction form
   4,919.31/7,377.30 = 2,145.15/x
3. Step 3: Cross multiply
   4,919.31x = 7,377.30 × 2,145.15
4. Step 4: Simplify right side
   4,919.31x = 15,825,415.10
5. Step 5: Solve for x
   x = 15,825,415.10/4,919.31
6. Step 6: Final answer
   x = 3,217.00