Finding the Fourth Proportional to 28,113.76, 42,164.42 and 8,118.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,113.76 : 42,164.42 = 8,118.91 : x
2. Step 2: Convert to fraction form
   28,113.76/42,164.42 = 8,118.91/x
3. Step 3: Cross multiply
   28,113.76x = 42,164.42 × 8,118.91
4. Step 4: Simplify right side
   28,113.76x = 342,329,090.59
5. Step 5: Solve for x
   x = 342,329,090.59/28,113.76
6. Step 6: Final answer
   x = 12,176.57