Finding the Fourth Proportional to 31,059.49, 42,861.91 and 16,912.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,059.49 : 42,861.91 = 16,912.30 : x
2. Step 2: Convert to fraction form
   31,059.49/42,861.91 = 16,912.30/x
3. Step 3: Cross multiply
   31,059.49x = 42,861.91 × 16,912.30
4. Step 4: Simplify right side
   31,059.49x = 724,893,181.62
5. Step 5: Solve for x
   x = 724,893,181.62/31,059.49
6. Step 6: Final answer
   x = 23,338.87