Finding the Fourth Proportional to 12,720.50, 19,080.78 and 3,955.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.50 : 19,080.78 = 3,955.41 : x
2. Step 2: Convert to fraction form
   12,720.50/19,080.78 = 3,955.41/x
3. Step 3: Cross multiply
   12,720.50x = 19,080.78 × 3,955.41
4. Step 4: Simplify right side
   12,720.50x = 75,472,308.02
5. Step 5: Solve for x
   x = 75,472,308.02/12,720.50
6. Step 6: Final answer
   x = 5,933.13