Finding the Fourth Proportional to 30,745.31, 42,420.04 and 17,315.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,745.31 : 42,420.04 = 17,315.78 : x
2. Step 2: Convert to fraction form
   30,745.31/42,420.04 = 17,315.78/x
3. Step 3: Cross multiply
   30,745.31x = 42,420.04 × 17,315.78
4. Step 4: Simplify right side
   30,745.31x = 734,535,824.84
5. Step 5: Solve for x
   x = 734,535,824.84/30,745.31
6. Step 6: Final answer
   x = 23,890.99