Finding the Fourth Proportional to 38,481.78, 53,105.98 and 21,485.76

Step by Step Solution

1. Step 1: Write the proportion equation
   38,481.78 : 53,105.98 = 21,485.76 : x
2. Step 2: Convert to fraction form
   38,481.78/53,105.98 = 21,485.76/x
3. Step 3: Cross multiply
   38,481.78x = 53,105.98 × 21,485.76
4. Step 4: Simplify right side
   38,481.78x = 1,141,022,128.27
5. Step 5: Solve for x
   x = 1,141,022,128.27/38,481.78
6. Step 6: Final answer
   x = 29,650.97