Finding the Fourth Proportional to 10,540.32, 15,821.15 and 5,279.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,540.32 : 15,821.15 = 5,279.10 : x
2. Step 2: Convert to fraction form
   10,540.32/15,821.15 = 5,279.10/x
3. Step 3: Cross multiply
   10,540.32x = 15,821.15 × 5,279.10
4. Step 4: Simplify right side
   10,540.32x = 83,521,432.97
5. Step 5: Solve for x
   x = 83,521,432.97/10,540.32
6. Step 6: Final answer
   x = 7,923.99