Finding the Fourth Proportional to 72,528.20, 108,789.56 and 19,936.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,528.20 : 108,789.56 = 19,936.32 : x
2. Step 2: Convert to fraction form
   72,528.20/108,789.56 = 19,936.32/x
3. Step 3: Cross multiply
   72,528.20x = 108,789.56 × 19,936.32
4. Step 4: Simplify right side
   72,528.20x = 2,168,863,480.82
5. Step 5: Solve for x
   x = 2,168,863,480.82/72,528.20
6. Step 6: Final answer
   x = 29,903.73