Finding the Fourth Proportional to 10,520.50, 15,786.15 and 5,326.51

Step by Step Solution

1. Step 1: Write the proportion equation
   10,520.50 : 15,786.15 = 5,326.51 : x
2. Step 2: Convert to fraction form
   10,520.50/15,786.15 = 5,326.51/x
3. Step 3: Cross multiply
   10,520.50x = 15,786.15 × 5,326.51
4. Step 4: Simplify right side
   10,520.50x = 84,085,085.84
5. Step 5: Solve for x
   x = 84,085,085.84/10,520.50
6. Step 6: Final answer
   x = 7,992.50