Finding the Fourth Proportional to 31,051.26, 42,800.94 and 20,976.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,051.26 : 42,800.94 = 20,976.48 : x
2. Step 2: Convert to fraction form
   31,051.26/42,800.94 = 20,976.48/x
3. Step 3: Cross multiply
   31,051.26x = 42,800.94 × 20,976.48
4. Step 4: Simplify right side
   31,051.26x = 897,813,061.89
5. Step 5: Solve for x
   x = 897,813,061.89/31,051.26
6. Step 6: Final answer
   x = 28,913.90