Finding the Fourth Proportional to 31,273.10, 43,139.37 and 18,513.83

Step by Step Solution

1. Step 1: Write the proportion equation
   31,273.10 : 43,139.37 = 18,513.83 : x
2. Step 2: Convert to fraction form
   31,273.10/43,139.37 = 18,513.83/x
3. Step 3: Cross multiply
   31,273.10x = 43,139.37 × 18,513.83
4. Step 4: Simplify right side
   31,273.10x = 798,675,035.62
5. Step 5: Solve for x
   x = 798,675,035.62/31,273.10
6. Step 6: Final answer
   x = 25,538.72