Finding the Fourth Proportional to 31,031.18, 42,831.82 and 18,291.74

Step by Step Solution

1. Step 1: Write the proportion equation
   31,031.18 : 42,831.82 = 18,291.74 : x
2. Step 2: Convert to fraction form
   31,031.18/42,831.82 = 18,291.74/x
3. Step 3: Cross multiply
   31,031.18x = 42,831.82 × 18,291.74
4. Step 4: Simplify right side
   31,031.18x = 783,468,515.17
5. Step 5: Solve for x
   x = 783,468,515.17/31,031.18
6. Step 6: Final answer
   x = 25,247.78