Finding the Fourth Proportional to 31,139.82, 42,971.74 and 16,992.68

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.82 : 42,971.74 = 16,992.68 : x
2. Step 2: Convert to fraction form
   31,139.82/42,971.74 = 16,992.68/x
3. Step 3: Cross multiply
   31,139.82x = 42,971.74 × 16,992.68
4. Step 4: Simplify right side
   31,139.82x = 730,204,769.52
5. Step 5: Solve for x
   x = 730,204,769.52/31,139.82
6. Step 6: Final answer
   x = 23,449.23