Finding the Fourth Proportional to 12,782.43, 17,639.82 and 7,476.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,782.43 : 17,639.82 = 7,476.21 : x
2. Step 2: Convert to fraction form
   12,782.43/17,639.82 = 7,476.21/x
3. Step 3: Cross multiply
   12,782.43x = 17,639.82 × 7,476.21
4. Step 4: Simplify right side
   12,782.43x = 131,878,998.68
5. Step 5: Solve for x
   x = 131,878,998.68/12,782.43
6. Step 6: Final answer
   x = 10,317.21