Finding the Fourth Proportional to 11,715.76, 17,558.16 and 7,020.64

Step by Step Solution

1. Step 1: Write the proportion equation
   11,715.76 : 17,558.16 = 7,020.64 : x
2. Step 2: Convert to fraction form
   11,715.76/17,558.16 = 7,020.64/x
3. Step 3: Cross multiply
   11,715.76x = 17,558.16 × 7,020.64
4. Step 4: Simplify right side
   11,715.76x = 123,269,520.42
5. Step 5: Solve for x
   x = 123,269,520.42/11,715.76
6. Step 6: Final answer
   x = 10,521.68