Finding the Fourth Proportional to 39,709.56, 54,796.71 and 21,804.45

Step by Step Solution

1. Step 1: Write the proportion equation
   39,709.56 : 54,796.71 = 21,804.45 : x
2. Step 2: Convert to fraction form
   39,709.56/54,796.71 = 21,804.45/x
3. Step 3: Cross multiply
   39,709.56x = 54,796.71 × 21,804.45
4. Step 4: Simplify right side
   39,709.56x = 1,194,812,123.36
5. Step 5: Solve for x
   x = 1,194,812,123.36/39,709.56
6. Step 6: Final answer
   x = 30,088.78