Finding the Fourth Proportional to 39,664.86, 54,737.30 and 21,759.42

Step by Step Solution

1. Step 1: Write the proportion equation
   39,664.86 : 54,737.30 = 21,759.42 : x
2. Step 2: Convert to fraction form
   39,664.86/54,737.30 = 21,759.42/x
3. Step 3: Cross multiply
   39,664.86x = 54,737.30 × 21,759.42
4. Step 4: Simplify right side
   39,664.86x = 1,191,051,900.37
5. Step 5: Solve for x
   x = 1,191,051,900.37/39,664.86
6. Step 6: Final answer
   x = 30,027.89