Finding the Fourth Proportional to 31,057.68, 42,858.48 and 16,910.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,057.68 : 42,858.48 = 16,910.20 : x
2. Step 2: Convert to fraction form
   31,057.68/42,858.48 = 16,910.20/x
3. Step 3: Cross multiply
   31,057.68x = 42,858.48 × 16,910.20
4. Step 4: Simplify right side
   31,057.68x = 724,745,468.50
5. Step 5: Solve for x
   x = 724,745,468.50/31,057.68
6. Step 6: Final answer
   x = 23,335.47