Finding the Fourth Proportional to 12,719.67, 19,079.72 and 4,399.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,719.67 : 19,079.72 = 4,399.91 : x
2. Step 2: Convert to fraction form
   12,719.67/19,079.72 = 4,399.91/x
3. Step 3: Cross multiply
   12,719.67x = 19,079.72 × 4,399.91
4. Step 4: Simplify right side
   12,719.67x = 83,948,933.43
5. Step 5: Solve for x
   x = 83,948,933.43/12,719.67
6. Step 6: Final answer
   x = 6,599.93