Finding the Fourth Proportional to 31,065.41, 42,870.76 and 16,918.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,065.41 : 42,870.76 = 16,918.25 : x
2. Step 2: Convert to fraction form
   31,065.41/42,870.76 = 16,918.25/x
3. Step 3: Cross multiply
   31,065.41x = 42,870.76 × 16,918.25
4. Step 4: Simplify right side
   31,065.41x = 725,297,978.72
5. Step 5: Solve for x
   x = 725,297,978.72/31,065.41
6. Step 6: Final answer
   x = 23,347.44