Finding the Fourth Proportional to 12,822.20, 17,695.52 and 7,158.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,822.20 : 17,695.52 = 7,158.06 : x
2. Step 2: Convert to fraction form
   12,822.20/17,695.52 = 7,158.06/x
3. Step 3: Cross multiply
   12,822.20x = 17,695.52 × 7,158.06
4. Step 4: Simplify right side
   12,822.20x = 126,665,518.59
5. Step 5: Solve for x
   x = 126,665,518.59/12,822.20
6. Step 6: Final answer
   x = 9,878.61