Finding the Fourth Proportional to 20,667.49, 31,006.10 and 6,435.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,667.49 : 31,006.10 = 6,435.31 : x
2. Step 2: Convert to fraction form
   20,667.49/31,006.10 = 6,435.31/x
3. Step 3: Cross multiply
   20,667.49x = 31,006.10 × 6,435.31
4. Step 4: Simplify right side
   20,667.49x = 199,533,833.21
5. Step 5: Solve for x
   x = 199,533,833.21/20,667.49
6. Step 6: Final answer
   x = 9,654.48