Finding the Fourth Proportional to 5,718.79, 7,886.12 and 3,830.07

Step by Step Solution

1. Step 1: Write the proportion equation
   5,718.79 : 7,886.12 = 3,830.07 : x
2. Step 2: Convert to fraction form
   5,718.79/7,886.12 = 3,830.07/x
3. Step 3: Cross multiply
   5,718.79x = 7,886.12 × 3,830.07
4. Step 4: Simplify right side
   5,718.79x = 30,204,391.63
5. Step 5: Solve for x
   x = 30,204,391.63/5,718.79
6. Step 6: Final answer
   x = 5,281.61