Finding the Fourth Proportional to 5,209.25, 7,811.12 and 3,907.98

Step by Step Solution

1. Step 1: Write the proportion equation
   5,209.25 : 7,811.12 = 3,907.98 : x
2. Step 2: Convert to fraction form
   5,209.25/7,811.12 = 3,907.98/x
3. Step 3: Cross multiply
   5,209.25x = 7,811.12 × 3,907.98
4. Step 4: Simplify right side
   5,209.25x = 30,525,710.51
5. Step 5: Solve for x
   x = 30,525,710.51/5,209.25
6. Step 6: Final answer
   x = 5,859.91