Finding the Fourth Proportional to 31,134.65, 42,965.98 and 16,987.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,134.65 : 42,965.98 = 16,987.79 : x
2. Step 2: Convert to fraction form
   31,134.65/42,965.98 = 16,987.79/x
3. Step 3: Cross multiply
   31,134.65x = 42,965.98 × 16,987.79
4. Step 4: Simplify right side
   31,134.65x = 729,897,110.33
5. Step 5: Solve for x
   x = 729,897,110.33/31,134.65
6. Step 6: Final answer
   x = 23,443.24