Finding the Fourth Proportional to 31,119.69, 42,945.06 and 16,972.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,119.69 : 42,945.06 = 16,972.50 : x
2. Step 2: Convert to fraction form
   31,119.69/42,945.06 = 16,972.50/x
3. Step 3: Cross multiply
   31,119.69x = 42,945.06 × 16,972.50
4. Step 4: Simplify right side
   31,119.69x = 728,885,030.85
5. Step 5: Solve for x
   x = 728,885,030.85/31,119.69
6. Step 6: Final answer
   x = 23,421.99