Finding the Fourth Proportional to 30,978.98, 42,749.89 and 16,831.54

Step by Step Solution

1. Step 1: Write the proportion equation
   30,978.98 : 42,749.89 = 16,831.54 : x
2. Step 2: Convert to fraction form
   30,978.98/42,749.89 = 16,831.54/x
3. Step 3: Cross multiply
   30,978.98x = 42,749.89 × 16,831.54
4. Step 4: Simplify right side
   30,978.98x = 719,546,483.53
5. Step 5: Solve for x
   x = 719,546,483.53/30,978.98
6. Step 6: Final answer
   x = 23,226.93