Finding the Fourth Proportional to 31,125.57, 42,952.59 and 16,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   31,125.57 : 42,952.59 = 16,978.92 : x
2. Step 2: Convert to fraction form
   31,125.57/42,952.59 = 16,978.92/x
3. Step 3: Cross multiply
   31,125.57x = 42,952.59 × 16,978.92
4. Step 4: Simplify right side
   31,125.57x = 729,288,589.40
5. Step 5: Solve for x
   x = 729,288,589.40/31,125.57
6. Step 6: Final answer
   x = 23,430.53