Finding the Fourth Proportional to 22,316.56, 30,796.86 and 12,885.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,316.56 : 30,796.86 = 12,885.12 : x
2. Step 2: Convert to fraction form
   22,316.56/30,796.86 = 12,885.12/x
3. Step 3: Cross multiply
   22,316.56x = 30,796.86 × 12,885.12
4. Step 4: Simplify right side
   22,316.56x = 396,821,236.72
5. Step 5: Solve for x
   x = 396,821,236.72/22,316.56
6. Step 6: Final answer
   x = 17,781.47