Finding the Fourth Proportional to 31,050.96, 42,836.48 and 20,976.16

Step by Step Solution

1. Step 1: Write the proportion equation
   31,050.96 : 42,836.48 = 20,976.16 : x
2. Step 2: Convert to fraction form
   31,050.96/42,836.48 = 20,976.16/x
3. Step 3: Cross multiply
   31,050.96x = 42,836.48 × 20,976.16
4. Step 4: Simplify right side
   31,050.96x = 898,544,858.32
5. Step 5: Solve for x
   x = 898,544,858.32/31,050.96
6. Step 6: Final answer
   x = 28,937.75