Finding the Fourth Proportional to 22,316.76, 30,799.86 and 12,885.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,316.76 : 30,799.86 = 12,885.30 : x
2. Step 2: Convert to fraction form
   22,316.76/30,799.86 = 12,885.30/x
3. Step 3: Cross multiply
   22,316.76x = 30,799.86 × 12,885.30
4. Step 4: Simplify right side
   22,316.76x = 396,865,436.06
5. Step 5: Solve for x
   x = 396,865,436.06/22,316.76
6. Step 6: Final answer
   x = 17,783.29