Finding the Fourth Proportional to 5,907.05, 8,155.13 and 3,920.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,907.05 : 8,155.13 = 3,920.30 : x
2. Step 2: Convert to fraction form
   5,907.05/8,155.13 = 3,920.30/x
3. Step 3: Cross multiply
   5,907.05x = 8,155.13 × 3,920.30
4. Step 4: Simplify right side
   5,907.05x = 31,970,561.83
5. Step 5: Solve for x
   x = 31,970,561.83/5,907.05
6. Step 6: Final answer
   x = 5,412.27