Finding the Fourth Proportional to 31,046.32, 42,793.98 and 20,971.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,046.32 : 42,793.98 = 20,971.60 : x
2. Step 2: Convert to fraction form
   31,046.32/42,793.98 = 20,971.60/x
3. Step 3: Cross multiply
   31,046.32x = 42,793.98 × 20,971.60
4. Step 4: Simplify right side
   31,046.32x = 897,458,230.97
5. Step 5: Solve for x
   x = 897,458,230.97/31,046.32
6. Step 6: Final answer
   x = 28,907.07