Finding the Fourth Proportional to 5,758.40, 8,641.98 and 3,905.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,758.40 : 8,641.98 = 3,905.12 : x
2. Step 2: Convert to fraction form
   5,758.40/8,641.98 = 3,905.12/x
3. Step 3: Cross multiply
   5,758.40x = 8,641.98 × 3,905.12
4. Step 4: Simplify right side
   5,758.40x = 33,747,968.94
5. Step 5: Solve for x
   x = 33,747,968.94/5,758.40
6. Step 6: Final answer
   x = 5,860.65