Finding the Fourth Proportional to 9,429.56, 13,012.16 and 5,179.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,429.56 : 13,012.16 = 5,179.79 : x
2. Step 2: Convert to fraction form
   9,429.56/13,012.16 = 5,179.79/x
3. Step 3: Cross multiply
   9,429.56x = 13,012.16 × 5,179.79
4. Step 4: Simplify right side
   9,429.56x = 67,400,165.29
5. Step 5: Solve for x
   x = 67,400,165.29/9,429.56
6. Step 6: Final answer
   x = 7,147.76