Finding the Fourth Proportional to 5,211.94, 7,810.32 and 3,957.16

Step by Step Solution

1. Step 1: Write the proportion equation
   5,211.94 : 7,810.32 = 3,957.16 : x
2. Step 2: Convert to fraction form
   5,211.94/7,810.32 = 3,957.16/x
3. Step 3: Cross multiply
   5,211.94x = 7,810.32 × 3,957.16
4. Step 4: Simplify right side
   5,211.94x = 30,906,685.89
5. Step 5: Solve for x
   x = 30,906,685.89/5,211.94
6. Step 6: Final answer
   x = 5,929.98