Finding the Fourth Proportional to 12,721.39, 17,556 and 7,056.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.39 : 17,556 = 7,056.15 : x
2. Step 2: Convert to fraction form
   12,721.39/17,556 = 7,056.15/x
3. Step 3: Cross multiply
   12,721.39x = 17,556 × 7,056.15
4. Step 4: Simplify right side
   12,721.39x = 123,877,769.40
5. Step 5: Solve for x
   x = 123,877,769.40/12,721.39
6. Step 6: Final answer
   x = 9,737.75