Finding the Fourth Proportional to 31,066.09, 42,878.93 and 19,139.65

Step by Step Solution

1. Step 1: Write the proportion equation
   31,066.09 : 42,878.93 = 19,139.65 : x
2. Step 2: Convert to fraction form
   31,066.09/42,878.93 = 19,139.65/x
3. Step 3: Cross multiply
   31,066.09x = 42,878.93 × 19,139.65
4. Step 4: Simplify right side
   31,066.09x = 820,687,712.57
5. Step 5: Solve for x
   x = 820,687,712.57/31,066.09
6. Step 6: Final answer
   x = 26,417.48