Finding the Fourth Proportional to 12,722.31, 19,086.72 and 3,957.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.31 : 19,086.72 = 3,957.30 : x
2. Step 2: Convert to fraction form
   12,722.31/19,086.72 = 3,957.30/x
3. Step 3: Cross multiply
   12,722.31x = 19,086.72 × 3,957.30
4. Step 4: Simplify right side
   12,722.31x = 75,531,877.06
5. Step 5: Solve for x
   x = 75,531,877.06/12,722.31
6. Step 6: Final answer
   x = 5,936.96