Finding the Fourth Proportional to 39,564.72, 54,599.22 and 21,659.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,564.72 : 54,599.22 = 21,659.72 : x
2. Step 2: Convert to fraction form
   39,564.72/54,599.22 = 21,659.72/x
3. Step 3: Cross multiply
   39,564.72x = 54,599.22 × 21,659.72
4. Step 4: Simplify right side
   39,564.72x = 1,182,603,817.42
5. Step 5: Solve for x
   x = 1,182,603,817.42/39,564.72
6. Step 6: Final answer
   x = 29,890.36