Finding the Fourth Proportional to 31,008.72, 42,777 and 18,424.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,008.72 : 42,777 = 18,424.56 : x
2. Step 2: Convert to fraction form
   31,008.72/42,777 = 18,424.56/x
3. Step 3: Cross multiply
   31,008.72x = 42,777 × 18,424.56
4. Step 4: Simplify right side
   31,008.72x = 788,147,403.12
5. Step 5: Solve for x
   x = 788,147,403.12/31,008.72
6. Step 6: Final answer
   x = 25,416.96