Finding the Fourth Proportional to 39,443.77, 54,432.12 and 21,538.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,443.77 : 54,432.12 = 21,538.72 : x
2. Step 2: Convert to fraction form
   39,443.77/54,432.12 = 21,538.72/x
3. Step 3: Cross multiply
   39,443.77x = 54,432.12 × 21,538.72
4. Step 4: Simplify right side
   39,443.77x = 1,172,398,191.69
5. Step 5: Solve for x
   x = 1,172,398,191.69/39,443.77
6. Step 6: Final answer
   x = 29,723.28