Finding the Fourth Proportional to 9,628.61, 13,285.86 and 5,379.51

Step by Step Solution

1. Step 1: Write the proportion equation
   9,628.61 : 13,285.86 = 5,379.51 : x
2. Step 2: Convert to fraction form
   9,628.61/13,285.86 = 5,379.51/x
3. Step 3: Cross multiply
   9,628.61x = 13,285.86 × 5,379.51
4. Step 4: Simplify right side
   9,628.61x = 71,471,491.77
5. Step 5: Solve for x
   x = 71,471,491.77/9,628.61
6. Step 6: Final answer
   x = 7,422.82