Finding the Fourth Proportional to 10,863.15, 15,003.48 and 7,320.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,863.15 : 15,003.48 = 7,320.21 : x
2. Step 2: Convert to fraction form
   10,863.15/15,003.48 = 7,320.21/x
3. Step 3: Cross multiply
   10,863.15x = 15,003.48 × 7,320.21
4. Step 4: Simplify right side
   10,863.15x = 109,828,624.33
5. Step 5: Solve for x
   x = 109,828,624.33/10,863.15
6. Step 6: Final answer
   x = 10,110.20