Finding the Fourth Proportional to 31,040.30, 42,811.58 and 20,952.76

Step by Step Solution

1. Step 1: Write the proportion equation
   31,040.30 : 42,811.58 = 20,952.76 : x
2. Step 2: Convert to fraction form
   31,040.30/42,811.58 = 20,952.76/x
3. Step 3: Cross multiply
   31,040.30x = 42,811.58 × 20,952.76
4. Step 4: Simplify right side
   31,040.30x = 897,020,706.31
5. Step 5: Solve for x
   x = 897,020,706.31/31,040.30
6. Step 6: Final answer
   x = 28,898.59