Finding the Fourth Proportional to 31,108.40, 42,928.32 and 16,960.94

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.40 : 42,928.32 = 16,960.94 : x
2. Step 2: Convert to fraction form
   31,108.40/42,928.32 = 16,960.94/x
3. Step 3: Cross multiply
   31,108.40x = 42,928.32 × 16,960.94
4. Step 4: Simplify right side
   31,108.40x = 728,104,659.82
5. Step 5: Solve for x
   x = 728,104,659.82/31,108.40
6. Step 6: Final answer
   x = 23,405.40