Finding the Fourth Proportional to 31,002.58, 42,783.69 and 18,427.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.58 : 42,783.69 = 18,427.42 : x
2. Step 2: Convert to fraction form
   31,002.58/42,783.69 = 18,427.42/x
3. Step 3: Cross multiply
   31,002.58x = 42,783.69 × 18,427.42
4. Step 4: Simplify right side
   31,002.58x = 788,393,024.78
5. Step 5: Solve for x
   x = 788,393,024.78/31,002.58
6. Step 6: Final answer
   x = 25,429.92