Finding the Fourth Proportional to 31,133.91, 42,964.94 and 16,987.05

Step by Step Solution

1. Step 1: Write the proportion equation
   31,133.91 : 42,964.94 = 16,987.05 : x
2. Step 2: Convert to fraction form
   31,133.91/42,964.94 = 16,987.05/x
3. Step 3: Cross multiply
   31,133.91x = 42,964.94 × 16,987.05
4. Step 4: Simplify right side
   31,133.91x = 729,847,499.09
5. Step 5: Solve for x
   x = 729,847,499.09/31,133.91
6. Step 6: Final answer
   x = 23,442.20