Finding the Fourth Proportional to 31,046.82, 42,794.67 and 20,972.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,046.82 : 42,794.67 = 20,972.10 : x
2. Step 2: Convert to fraction form
   31,046.82/42,794.67 = 20,972.10/x
3. Step 3: Cross multiply
   31,046.82x = 42,794.67 × 20,972.10
4. Step 4: Simplify right side
   31,046.82x = 897,494,098.71
5. Step 5: Solve for x
   x = 897,494,098.71/31,046.82
6. Step 6: Final answer
   x = 28,907.76