Finding the Fourth Proportional to 13,079.71, 19,619.73 and 3,719.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,079.71 : 19,619.73 = 3,719.72 : x
2. Step 2: Convert to fraction form
   13,079.71/19,619.73 = 3,719.72/x
3. Step 3: Cross multiply
   13,079.71x = 19,619.73 × 3,719.72
4. Step 4: Simplify right side
   13,079.71x = 72,979,902.08
5. Step 5: Solve for x
   x = 72,979,902.08/13,079.71
6. Step 6: Final answer
   x = 5,579.63