Finding the Fourth Proportional to 31,109.67, 42,930.81 and 16,962.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.67 : 42,930.81 = 16,962.21 : x
2. Step 2: Convert to fraction form
   31,109.67/42,930.81 = 16,962.21/x
3. Step 3: Cross multiply
   31,109.67x = 42,930.81 × 16,962.21
4. Step 4: Simplify right side
   31,109.67x = 728,201,414.69
5. Step 5: Solve for x
   x = 728,201,414.69/31,109.67
6. Step 6: Final answer
   x = 23,407.56