Finding the Fourth Proportional to 31,006.46, 42,789.04 and 18,431.30

Step by Step Solution

1. Step 1: Write the proportion equation
   31,006.46 : 42,789.04 = 18,431.30 : x
2. Step 2: Convert to fraction form
   31,006.46/42,789.04 = 18,431.30/x
3. Step 3: Cross multiply
   31,006.46x = 42,789.04 × 18,431.30
4. Step 4: Simplify right side
   31,006.46x = 788,657,372.93
5. Step 5: Solve for x
   x = 788,657,372.93/31,006.46
6. Step 6: Final answer
   x = 25,435.26