Finding the Fourth Proportional to 31,069.59, 42,879.02 and 19,139.91

Step by Step Solution

1. Step 1: Write the proportion equation
   31,069.59 : 42,879.02 = 19,139.91 : x
2. Step 2: Convert to fraction form
   31,069.59/42,879.02 = 19,139.91/x
3. Step 3: Cross multiply
   31,069.59x = 42,879.02 × 19,139.91
4. Step 4: Simplify right side
   31,069.59x = 820,700,487.99
5. Step 5: Solve for x
   x = 820,700,487.99/31,069.59
6. Step 6: Final answer
   x = 26,414.91