Finding the Fourth Proportional to 31,065.29, 42,870.59 and 16,918.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,065.29 : 42,870.59 = 16,918.12 : x
2. Step 2: Convert to fraction form
   31,065.29/42,870.59 = 16,918.12/x
3. Step 3: Cross multiply
   31,065.29x = 42,870.59 × 16,918.12
4. Step 4: Simplify right side
   31,065.29x = 725,289,786.09
5. Step 5: Solve for x
   x = 725,289,786.09/31,065.29
6. Step 6: Final answer
   x = 23,347.27