Finding the Fourth Proportional to 12,723.56, 19,088.10 and 3,959.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,723.56 : 19,088.10 = 3,959.18 : x
2. Step 2: Convert to fraction form
   12,723.56/19,088.10 = 3,959.18/x
3. Step 3: Cross multiply
   12,723.56x = 19,088.10 × 3,959.18
4. Step 4: Simplify right side
   12,723.56x = 75,573,128.32
5. Step 5: Solve for x
   x = 75,573,128.32/12,723.56
6. Step 6: Final answer
   x = 5,939.62