Finding the Fourth Proportional to 12,721.40, 17,555.58 and 7,056.67

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.40 : 17,555.58 = 7,056.67 : x
2. Step 2: Convert to fraction form
   12,721.40/17,555.58 = 7,056.67/x
3. Step 3: Cross multiply
   12,721.40x = 17,555.58 × 7,056.67
4. Step 4: Simplify right side
   12,721.40x = 123,883,934.72
5. Step 5: Solve for x
   x = 123,883,934.72/12,721.40
6. Step 6: Final answer
   x = 9,738.23