Finding the Fourth Proportional to 31,031.28, 42,826.32 and 18,288.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,031.28 : 42,826.32 = 18,288.42 : x
2. Step 2: Convert to fraction form
   31,031.28/42,826.32 = 18,288.42/x
3. Step 3: Cross multiply
   31,031.28x = 42,826.32 × 18,288.42
4. Step 4: Simplify right side
   31,031.28x = 783,225,727.21
5. Step 5: Solve for x
   x = 783,225,727.21/31,031.28
6. Step 6: Final answer
   x = 25,239.88