Finding the Fourth Proportional to 31,082.09, 42,859.29 and 20,993.01

Step by Step Solution

1. Step 1: Write the proportion equation
   31,082.09 : 42,859.29 = 20,993.01 : x
2. Step 2: Convert to fraction form
   31,082.09/42,859.29 = 20,993.01/x
3. Step 3: Cross multiply
   31,082.09x = 42,859.29 × 20,993.01
4. Step 4: Simplify right side
   31,082.09x = 899,745,503.56
5. Step 5: Solve for x
   x = 899,745,503.56/31,082.09
6. Step 6: Final answer
   x = 28,947.40