Finding the Fourth Proportional to 31,103.53, 42,921.79 and 16,956.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,103.53 : 42,921.79 = 16,956.09 : x
2. Step 2: Convert to fraction form
   31,103.53/42,921.79 = 16,956.09/x
3. Step 3: Cross multiply
   31,103.53x = 42,921.79 × 16,956.09
4. Step 4: Simplify right side
   31,103.53x = 727,785,649.42
5. Step 5: Solve for x
   x = 727,785,649.42/31,103.53
6. Step 6: Final answer
   x = 23,398.81