Finding the Fourth Proportional to 10,920.89, 16,356.71 and 7,648.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,920.89 : 16,356.71 = 7,648.59 : x
2. Step 2: Convert to fraction form
   10,920.89/16,356.71 = 7,648.59/x
3. Step 3: Cross multiply
   10,920.89x = 16,356.71 × 7,648.59
4. Step 4: Simplify right side
   10,920.89x = 125,105,768.54
5. Step 5: Solve for x
   x = 125,105,768.54/10,920.89
6. Step 6: Final answer
   x = 11,455.64