Finding the Fourth Proportional to 31,108.50, 42,928.29 and 16,961.22

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.50 : 42,928.29 = 16,961.22 : x
2. Step 2: Convert to fraction form
   31,108.50/42,928.29 = 16,961.22/x
3. Step 3: Cross multiply
   31,108.50x = 42,928.29 × 16,961.22
4. Step 4: Simplify right side
   31,108.50x = 728,116,170.91
5. Step 5: Solve for x
   x = 728,116,170.91/31,108.50
6. Step 6: Final answer
   x = 23,405.70