Finding the Fourth Proportional to 20,667.24, 31,005.72 and 6,435

Step by Step Solution

1. Step 1: Write the proportion equation
   20,667.24 : 31,005.72 = 6,435 : x
2. Step 2: Convert to fraction form
   20,667.24/31,005.72 = 6,435/x
3. Step 3: Cross multiply
   20,667.24x = 31,005.72 × 6,435
4. Step 4: Simplify right side
   20,667.24x = 199,521,808.20
5. Step 5: Solve for x
   x = 199,521,808.20/20,667.24
6. Step 6: Final answer
   x = 9,654.01