Finding the Fourth Proportional to 39,300.72, 54,234.96 and 21,395.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,300.72 : 54,234.96 = 21,395.72 : x
2. Step 2: Convert to fraction form
   39,300.72/54,234.96 = 21,395.72/x
3. Step 3: Cross multiply
   39,300.72x = 54,234.96 × 21,395.72
4. Step 4: Simplify right side
   39,300.72x = 1,160,396,018.37
5. Step 5: Solve for x
   x = 1,160,396,018.37/39,300.72
6. Step 6: Final answer
   x = 29,526.08