Finding the Fourth Proportional to 12,821.46, 17,698.32 and 7,520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,821.46 : 17,698.32 = 7,520.72 : x
2. Step 2: Convert to fraction form
   12,821.46/17,698.32 = 7,520.72/x
3. Step 3: Cross multiply
   12,821.46x = 17,698.32 × 7,520.72
4. Step 4: Simplify right side
   12,821.46x = 133,104,109.19
5. Step 5: Solve for x
   x = 133,104,109.19/12,821.46
6. Step 6: Final answer
   x = 10,381.35