Finding the Fourth Proportional to 31,059.05, 42,861.56 and 16,912.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,059.05 : 42,861.56 = 16,912.80 : x
2. Step 2: Convert to fraction form
   31,059.05/42,861.56 = 16,912.80/x
3. Step 3: Cross multiply
   31,059.05x = 42,861.56 × 16,912.80
4. Step 4: Simplify right side
   31,059.05x = 724,908,907.40
5. Step 5: Solve for x
   x = 724,908,907.40/31,059.05
6. Step 6: Final answer
   x = 23,339.70