Finding the Fourth Proportional to 31,125.07, 42,951.90 and 16,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,125.07 : 42,951.90 = 16,978.42 : x
2. Step 2: Convert to fraction form
   31,125.07/42,951.90 = 16,978.42/x
3. Step 3: Cross multiply
   31,125.07x = 42,951.90 × 16,978.42
4. Step 4: Simplify right side
   31,125.07x = 729,255,398.00
5. Step 5: Solve for x
   x = 729,255,398.00/31,125.07
6. Step 6: Final answer
   x = 23,429.84