Finding the Fourth Proportional to 31,058.37, 42,861.15 and 16,911.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,058.37 : 42,861.15 = 16,911.21 : x
2. Step 2: Convert to fraction form
   31,058.37/42,861.15 = 16,911.21/x
3. Step 3: Cross multiply
   31,058.37x = 42,861.15 × 16,911.21
4. Step 4: Simplify right side
   31,058.37x = 724,834,069.22
5. Step 5: Solve for x
   x = 724,834,069.22/31,058.37
6. Step 6: Final answer
   x = 23,337.80