Finding the Fourth Proportional to 31,069.22, 42,878.50 and 19,139.54

Step by Step Solution

1. Step 1: Write the proportion equation
   31,069.22 : 42,878.50 = 19,139.54 : x
2. Step 2: Convert to fraction form
   31,069.22/42,878.50 = 19,139.54/x
3. Step 3: Cross multiply
   31,069.22x = 42,878.50 × 19,139.54
4. Step 4: Simplify right side
   31,069.22x = 820,674,503.65
5. Step 5: Solve for x
   x = 820,674,503.65/31,069.22
6. Step 6: Final answer
   x = 26,414.39