Finding the Fourth Proportional to 28,156.80, 38,811.72 and 22,179

Step by Step Solution

1. Step 1: Write the proportion equation
   28,156.80 : 38,811.72 = 22,179 : x
2. Step 2: Convert to fraction form
   28,156.80/38,811.72 = 22,179/x
3. Step 3: Cross multiply
   28,156.80x = 38,811.72 × 22,179
4. Step 4: Simplify right side
   28,156.80x = 860,805,137.88
5. Step 5: Solve for x
   x = 860,805,137.88/28,156.80
6. Step 6: Final answer
   x = 30,571.84