Finding the Fourth Proportional to 39,592.33, 54,638.69 and 21,688.29

Step by Step Solution

1. Step 1: Write the proportion equation
   39,592.33 : 54,638.69 = 21,688.29 : x
2. Step 2: Convert to fraction form
   39,592.33/54,638.69 = 21,688.29/x
3. Step 3: Cross multiply
   39,592.33x = 54,638.69 × 21,688.29
4. Step 4: Simplify right side
   39,592.33x = 1,185,019,645.50
5. Step 5: Solve for x
   x = 1,185,019,645.50/39,592.33
6. Step 6: Final answer
   x = 29,930.54