Finding the Fourth Proportional to 12,822.57, 17,690.99 and 7,156.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,822.57 : 17,690.99 = 7,156.40 : x
2. Step 2: Convert to fraction form
   12,822.57/17,690.99 = 7,156.40/x
3. Step 3: Cross multiply
   12,822.57x = 17,690.99 × 7,156.40
4. Step 4: Simplify right side
   12,822.57x = 126,603,676.60
5. Step 5: Solve for x
   x = 126,603,676.60/12,822.57
6. Step 6: Final answer
   x = 9,873.50