Finding the Fourth Proportional to 31,144.62, 42,979.62 and 16,998.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,144.62 : 42,979.62 = 16,998.30 : x
2. Step 2: Convert to fraction form
   31,144.62/42,979.62 = 16,998.30/x
3. Step 3: Cross multiply
   31,144.62x = 42,979.62 × 16,998.30
4. Step 4: Simplify right side
   31,144.62x = 730,580,474.65
5. Step 5: Solve for x
   x = 730,580,474.65/31,144.62
6. Step 6: Final answer
   x = 23,457.68