Finding the Fourth Proportional to 31,031.35, 42,826.42 and 18,288.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,031.35 : 42,826.42 = 18,288.48 : x
2. Step 2: Convert to fraction form
   31,031.35/42,826.42 = 18,288.48/x
3. Step 3: Cross multiply
   31,031.35x = 42,826.42 × 18,288.48
4. Step 4: Simplify right side
   31,031.35x = 783,230,309.10
5. Step 5: Solve for x
   x = 783,230,309.10/31,031.35
6. Step 6: Final answer
   x = 25,239.97