Finding the Fourth Proportional to 28,111.70, 42,161.33 and 8,116.85

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.70 : 42,161.33 = 8,116.85 : x
2. Step 2: Convert to fraction form
   28,111.70/42,161.33 = 8,116.85/x
3. Step 3: Cross multiply
   28,111.70x = 42,161.33 × 8,116.85
4. Step 4: Simplify right side
   28,111.70x = 342,216,940.02
5. Step 5: Solve for x
   x = 342,216,940.02/28,111.70
6. Step 6: Final answer
   x = 12,173.47