Finding the Fourth Proportional to 39,837, 54,978.72 and 21,935.64

Step by Step Solution

1. Step 1: Write the proportion equation
   39,837 : 54,978.72 = 21,935.64 : x
2. Step 2: Convert to fraction form
   39,837/54,978.72 = 21,935.64/x
3. Step 3: Cross multiply
   39,837x = 54,978.72 × 21,935.64
4. Step 4: Simplify right side
   39,837x = 1,205,993,409.58
5. Step 5: Solve for x
   x = 1,205,993,409.58/39,837
6. Step 6: Final answer
   x = 30,273.20