Finding the Fourth Proportional to 30,831.42, 42,535.98 and 20,235.45

Step by Step Solution

1. Step 1: Write the proportion equation
   30,831.42 : 42,535.98 = 20,235.45 : x
2. Step 2: Convert to fraction form
   30,831.42/42,535.98 = 20,235.45/x
3. Step 3: Cross multiply
   30,831.42x = 42,535.98 × 20,235.45
4. Step 4: Simplify right side
   30,831.42x = 860,734,696.49
5. Step 5: Solve for x
   x = 860,734,696.49/30,831.42
6. Step 6: Final answer
   x = 27,917.45