Finding the Fourth Proportional to 13,039.72, 19,566.16 and 5,147.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,039.72 : 19,566.16 = 5,147.89 : x
2. Step 2: Convert to fraction form
   13,039.72/19,566.16 = 5,147.89/x
3. Step 3: Cross multiply
   13,039.72x = 19,566.16 × 5,147.89
4. Step 4: Simplify right side
   13,039.72x = 100,724,377.62
5. Step 5: Solve for x
   x = 100,724,377.62/13,039.72
6. Step 6: Final answer
   x = 7,724.43