Finding the Fourth Proportional to 30,775.31, 42,459.33 and 18,679.61

Step by Step Solution

1. Step 1: Write the proportion equation
   30,775.31 : 42,459.33 = 18,679.61 : x
2. Step 2: Convert to fraction form
   30,775.31/42,459.33 = 18,679.61/x
3. Step 3: Cross multiply
   30,775.31x = 42,459.33 × 18,679.61
4. Step 4: Simplify right side
   30,775.31x = 793,123,512.96
5. Step 5: Solve for x
   x = 793,123,512.96/30,775.31
6. Step 6: Final answer
   x = 25,771.42