Finding the Fourth Proportional to 31,105.78, 42,926.85 and 19,008.22

Step by Step Solution

1. Step 1: Write the proportion equation
   31,105.78 : 42,926.85 = 19,008.22 : x
2. Step 2: Convert to fraction form
   31,105.78/42,926.85 = 19,008.22/x
3. Step 3: Cross multiply
   31,105.78x = 42,926.85 × 19,008.22
4. Step 4: Simplify right side
   31,105.78x = 815,963,008.71
5. Step 5: Solve for x
   x = 815,963,008.71/31,105.78
6. Step 6: Final answer
   x = 26,231.88