Finding the Fourth Proportional to 39,820.52, 54,950.24 and 21,912.06

Step by Step Solution

1. Step 1: Write the proportion equation
   39,820.52 : 54,950.24 = 21,912.06 : x
2. Step 2: Convert to fraction form
   39,820.52/54,950.24 = 21,912.06/x
3. Step 3: Cross multiply
   39,820.52x = 54,950.24 × 21,912.06
4. Step 4: Simplify right side
   39,820.52x = 1,204,072,955.89
5. Step 5: Solve for x
   x = 1,204,072,955.89/39,820.52
6. Step 6: Final answer
   x = 30,237.50