Finding the Fourth Proportional to 4,939.59, 7,415.18 and 3,900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   4,939.59 : 7,415.18 = 3,900.30 : x
2. Step 2: Convert to fraction form
   4,939.59/7,415.18 = 3,900.30/x
3. Step 3: Cross multiply
   4,939.59x = 7,415.18 × 3,900.30
4. Step 4: Simplify right side
   4,939.59x = 28,921,407.05
5. Step 5: Solve for x
   x = 28,921,407.05/4,939.59
6. Step 6: Final answer
   x = 5,855.02