Finding the Fourth Proportional to 31,093.36, 42,914.34 and 18,345.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,093.36 : 42,914.34 = 18,345.78 : x
2. Step 2: Convert to fraction form
   31,093.36/42,914.34 = 18,345.78/x
3. Step 3: Cross multiply
   31,093.36x = 42,914.34 × 18,345.78
4. Step 4: Simplify right side
   31,093.36x = 787,297,040.49
5. Step 5: Solve for x
   x = 787,297,040.49/31,093.36
6. Step 6: Final answer
   x = 25,320.43