Finding the Fourth Proportional to 31,563.69, 43,559.18 and 18,139.15

Step by Step Solution

1. Step 1: Write the proportion equation
   31,563.69 : 43,559.18 = 18,139.15 : x
2. Step 2: Convert to fraction form
   31,563.69/43,559.18 = 18,139.15/x
3. Step 3: Cross multiply
   31,563.69x = 43,559.18 × 18,139.15
4. Step 4: Simplify right side
   31,563.69x = 790,126,499.90
5. Step 5: Solve for x
   x = 790,126,499.90/31,563.69
6. Step 6: Final answer
   x = 25,032.77