Finding the Fourth Proportional to 12,821.43, 17,693.47 and 7,156.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,821.43 : 17,693.47 = 7,156.09 : x
2. Step 2: Convert to fraction form
   12,821.43/17,693.47 = 7,156.09/x
3. Step 3: Cross multiply
   12,821.43x = 17,693.47 × 7,156.09
4. Step 4: Simplify right side
   12,821.43x = 126,616,063.73
5. Step 5: Solve for x
   x = 126,616,063.73/12,821.43
6. Step 6: Final answer
   x = 9,875.35