Finding the Fourth Proportional to 31,259.78, 43,138.49 and 17,112.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,259.78 : 43,138.49 = 17,112.62 : x
2. Step 2: Convert to fraction form
   31,259.78/43,138.49 = 17,112.62/x
3. Step 3: Cross multiply
   31,259.78x = 43,138.49 × 17,112.62
4. Step 4: Simplify right side
   31,259.78x = 738,212,716.82
5. Step 5: Solve for x
   x = 738,212,716.82/31,259.78
6. Step 6: Final answer
   x = 23,615.42