Finding the Fourth Proportional to 20,819.14, 31,145.72 and 18,078.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,819.14 : 31,145.72 = 18,078.10 : x
2. Step 2: Convert to fraction form
   20,819.14/31,145.72 = 18,078.10/x
3. Step 3: Cross multiply
   20,819.14x = 31,145.72 × 18,078.10
4. Step 4: Simplify right side
   20,819.14x = 563,055,272.48
5. Step 5: Solve for x
   x = 563,055,272.48/20,819.14
6. Step 6: Final answer
   x = 27,045.08