Finding the Fourth Proportional to 20,415.78, 30,624.72 and 5,624.37

Step by Step Solution

1. Step 1: Write the proportion equation
   20,415.78 : 30,624.72 = 5,624.37 : x
2. Step 2: Convert to fraction form
   20,415.78/30,624.72 = 5,624.37/x
3. Step 3: Cross multiply
   20,415.78x = 30,624.72 × 5,624.37
4. Step 4: Simplify right side
   20,415.78x = 172,244,735.34
5. Step 5: Solve for x
   x = 172,244,735.34/20,415.78
6. Step 6: Final answer
   x = 8,436.84