Finding the Fourth Proportional to 12,804.77, 19,206.48 and 3,920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,804.77 : 19,206.48 = 3,920.10 : x
2. Step 2: Convert to fraction form
   12,804.77/19,206.48 = 3,920.10/x
3. Step 3: Cross multiply
   12,804.77x = 19,206.48 × 3,920.10
4. Step 4: Simplify right side
   12,804.77x = 75,291,393.90
5. Step 5: Solve for x
   x = 75,291,393.90/12,804.77
6. Step 6: Final answer
   x = 5,879.95