Finding the Fourth Proportional to 19,872.72, 29,805.89 and 5,080.85

Step by Step Solution

1. Step 1: Write the proportion equation
   19,872.72 : 29,805.89 = 5,080.85 : x
2. Step 2: Convert to fraction form
   19,872.72/29,805.89 = 5,080.85/x
3. Step 3: Cross multiply
   19,872.72x = 29,805.89 × 5,080.85
4. Step 4: Simplify right side
   19,872.72x = 151,439,256.21
5. Step 5: Solve for x
   x = 151,439,256.21/19,872.72
6. Step 6: Final answer
   x = 7,620.46