Finding the Fourth Proportional to 39,259.32, 54,178.56 and 21,354.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,259.32 : 54,178.56 = 21,354.72 : x
2. Step 2: Convert to fraction form
   39,259.32/54,178.56 = 21,354.72/x
3. Step 3: Cross multiply
   39,259.32x = 54,178.56 × 21,354.72
4. Step 4: Simplify right side
   39,259.32x = 1,156,967,978.80
5. Step 5: Solve for x
   x = 1,156,967,978.80/39,259.32
6. Step 6: Final answer
   x = 29,469.89