Finding the Fourth Proportional to 31,126.18, 42,954.04 and 16,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   31,126.18 : 42,954.04 = 16,978.92 : x
2. Step 2: Convert to fraction form
   31,126.18/42,954.04 = 16,978.92/x
3. Step 3: Cross multiply
   31,126.18x = 42,954.04 × 16,978.92
4. Step 4: Simplify right side
   31,126.18x = 729,313,262.85
5. Step 5: Solve for x
   x = 729,313,262.85/31,126.18
6. Step 6: Final answer
   x = 23,430.86