Finding the Fourth Proportional to 39,698.37, 54,784.38 and 21,795

Step by Step Solution

1. Step 1: Write the proportion equation
   39,698.37 : 54,784.38 = 21,795 : x
2. Step 2: Convert to fraction form
   39,698.37/54,784.38 = 21,795/x
3. Step 3: Cross multiply
   39,698.37x = 54,784.38 × 21,795
4. Step 4: Simplify right side
   39,698.37x = 1,194,025,562.10
5. Step 5: Solve for x
   x = 1,194,025,562.10/39,698.37
6. Step 6: Final answer
   x = 30,077.45