Finding the Fourth Proportional to 31,036.81, 42,831 and 16,889.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,036.81 : 42,831 = 16,889.76 : x
2. Step 2: Convert to fraction form
   31,036.81/42,831 = 16,889.76/x
3. Step 3: Cross multiply
   31,036.81x = 42,831 × 16,889.76
4. Step 4: Simplify right side
   31,036.81x = 723,405,310.56
5. Step 5: Solve for x
   x = 723,405,310.56/31,036.81
6. Step 6: Final answer
   x = 23,307.98