Finding the Fourth Proportional to 10,821.09, 14,945.41 and 7,278.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,821.09 : 14,945.41 = 7,278.15 : x
2. Step 2: Convert to fraction form
   10,821.09/14,945.41 = 7,278.15/x
3. Step 3: Cross multiply
   10,821.09x = 14,945.41 × 7,278.15
4. Step 4: Simplify right side
   10,821.09x = 108,775,000.93
5. Step 5: Solve for x
   x = 108,775,000.93/10,821.09
6. Step 6: Final answer
   x = 10,052.13