Finding the Fourth Proportional to 31,120.18, 42,945.33 and 16,972.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,120.18 : 42,945.33 = 16,972.18 : x
2. Step 2: Convert to fraction form
   31,120.18/42,945.33 = 16,972.18/x
3. Step 3: Cross multiply
   31,120.18x = 42,945.33 × 16,972.18
4. Step 4: Simplify right side
   31,120.18x = 728,875,870.92
5. Step 5: Solve for x
   x = 728,875,870.92/31,120.18
6. Step 6: Final answer
   x = 23,421.33