Finding the Fourth Proportional to 30,965.98, 42,750.76 and 20,386.37

Step by Step Solution

1. Step 1: Write the proportion equation
   30,965.98 : 42,750.76 = 20,386.37 : x
2. Step 2: Convert to fraction form
   30,965.98/42,750.76 = 20,386.37/x
3. Step 3: Cross multiply
   30,965.98x = 42,750.76 × 20,386.37
4. Step 4: Simplify right side
   30,965.98x = 871,532,495.46
5. Step 5: Solve for x
   x = 871,532,495.46/30,965.98
6. Step 6: Final answer
   x = 28,144.84